Answer:
a = 10m/s^2
Explanation:
Recall that F=ma, therefore, to find acceleration, we need to rearange the equation in such a manner that it would equal acceleration:
[tex]F=ma\\\frac{F}{m} =a\\\\\frac{120N}{12kg}=a\\10m/s^2=a[/tex]
An engine has 180,000 W of power and can accelerate from rest to a top speed in 9 s. How much work did the engine do?
Answer:
1620000J
Explanation:
Given parameters:
Power = 180000W
Time = 9s
Unknown:
Work done by the engine = ?
Solution:
Power is the rate at which work is being done.
Now,
Power = [tex]\frac{Work done }{time}[/tex]
Work done = Power x time taken
Work done = 180000 x 9 = 1620000J
The first five questions refer to the following problem:
A model rocket lifts off with an upward thrust of 35 Newtons. It has a mass of 2.5 kilograms and a weight of 25 Newtons. How quickly does the rocket accelerate?
What is the first equation you would use to answer this question?
Question 3 options:
Fnet=F↑−F↓
Δt=Δdv
Δd=d2−d1
F12=−F21
Answer:
Δd=d2−d1Explanation:
good morningWhat perspective emphasizes the human capacity of personal growth?
The ability of people to grow personally is highlighted by the humanistic psychology viewpoint.
In opposition to psychoanalytic theory and behaviorism, the humanistic perspective gained popularity in the middle of the 20th century. It highlights how healthy people develop and a person's innate desire for self-actualization and creativity. The humanistic perspective seeks to understand a person as a complete rather than just via one particular component of their personality. It is a subfield of psychology that deals with the notion of being wholly original and distinctive. A school of thought or philosophy known as "psychological perspective" is one that would help someone comprehend someone else's conduct.
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please help asap!!!!
Answer:
D. 100% Chance of having a child with dimple
A 75.0kg diver falls from a 3.00m board into the water. She goes 2.40m into the water before stopping. What is the average force the water exerted on the diver?
Answer:
The potential energy of the diver at the top is equal to the net work needed to be done to stop the diver.
PE = W
mg(h+d) = Fd
Explanation:
the metric unit of force is the newton (n) , which is kg⋅m/s2 . convert 10kg⋅cm/s2 to newtons. 1×10−1n 1 times 10 to the power of negative 2 uppercase n 1×10−2n 1 times 10 to the power of negative 5 uppercase n 1×10−5n 1 times 10 to the power of negative 6 uppercase n 1×10−6n
The metric unit of force is the newton (n) , which is kg⋅m/s2 . convert 10kg⋅cm/s2 to newtons is 1 x 10⁻¹.
Newton's LawThe three fundamental laws of classical mechanics known as Newton's laws of motion. These laws can be stated as follows : Unless acted upon by a force, a body remains at rest or in motion in a straight path at a constant speed.
First law : Unless a force acts on an item, it will not modify its motion.
Second law : An object's force is determined by multiplying its mass by its acceleration.
The third law states that every action has a corresponding and opposing reaction.
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Iwill need to use more force to stopa
O Lighter mass
O Heavier mass
Answer:
a heavier mass
Explanation:
What do both types of bone marrow do that is found in our long bones.
(answer asappp)
Answer:
There are two types of bone marrow – red bone marrow (myeloid tissue) and yellow bone marrow (fatty tissue). Red bone marrow is involved in production of blood cells, while yellow marrow is important for fat storage. As you age, yellow bone marrow replaces red bone marrow.
Explanation:
pls mark brainliest :D
Will mark the brainliest
A nail of mass ,7.0g is held horizontally and is hit by a hammer of mass 0.25kg moving at 10ms −1. The hammer remains in contact with the nail during and after the blow.
If velocity of nail and hammer immediately after the blow is 9.7ms-1 Calculate the impulse transferred to the nail
Answer:
The impulse transferred to the nail is 0.01 kg*m/s.
Explanation:
The impulse (J) transferred to the nail can be found using the following equation:
[tex] J = \Delta p = p_{f} - p_{i} [/tex]
Where:
[tex]p_{f}[/tex]: is the final momentum
[tex]p_{i}[/tex]: is the initial momentum
The initial momentum is given by:
[tex] p_{i} = m_{1}v_{1_{i}} + m_{2}v_{2_{i}} [/tex]
Where 1 is for the hammer and 2 is for the nail.
Since the hammer is moving down (in the negative direction):
[tex]v_{1_{i}} = -10 m/s [/tex]
And because the nail is not moving:
[tex]v_{2_{i}}= 0[/tex]
[tex] p_{i} = m_{1}v_{1_{i}} = 0.25 kg*(-10 m/s) = -2.5 kg*m/s [/tex]
Now, the final momentum can be found taking into account that the hammer remains in contact with the nail during and after the blow:
[tex] p_{f} = m_{1}v_{1_{f}} + m_{2}v_{2_{f}} [/tex]
Since the hammer and the nail are moving in the negative direction:
[tex]v_{1_{f}}[/tex] = [tex]v_{2_{f}}[/tex] = -9.7 m/s
[tex] p_{f} = -9.7 m/s(7 \cdot 10^{-3} kg + 0.25 kg) = -2.49 kg*m/s [/tex]
Finally, the impulse is:
[tex] J = p_{f} - p_{i} = - 2.49 kg*m/s + 2.50 kg*m/s = 0.01 kg*m/s [/tex]
Therefore, the impulse transferred to the nail is 0.01 kg*m/s.
I hope it helps you!
Which two statements correctly describe transmutation?
Answ. B and C
Explanation:
The two statements which correctly describes transmutation include the following:
The number of atom is not conserved.The parent and daughter elements are different.What is Transmutation?This is the process of conversion of a chemical element into another with the atomic nuclei being changed.
Transmutation has true statements which are mentioned above thereby making option B and C the most appropriate choice.
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Give one example which describes Newton's first law of motion.
Answer:
a moving car
Explanation:
a body remains in its constant state unless un extenal force is applied.
Which statement best explains the relationship between the electric force between two charged objects and the distance between them? A. As the distance increases by a factor, the electric force increases by the square of that factor. B. As the distance increases by a factor, the electric force increases by twice that factor. C. As the distance increases by a factor, the electric force decreases by twice that factor. D. As the distance increases by a factor, the electric force decreases by the same factor. E. As the distance increases by a factor, the electric force decreases by the square of that factor.
Answer: I think it’s C but I’m not completely sure about it please correct me if I’m wrong
Compare and contrast types of radioactive decay involving alpha particles, beta particles, and gamma radiation.
In alpha decay, the nucleus loses two protons, in beta decay, the nucleus either loses or gains a proton whereas in gamma decay, no change in proton number occurs only energy is released.
How do the types of radioactive decay compare?Alpha decay is a type of radioactive decay in which the nucleus of an atom emits an alpha particle which leads to transforming into a new atomic nucleus by losing two protons. During beta decay, the proton in the nucleus is transformed into a neutron and and neutron is transformed into proton while on the other hand, gamma decay is a type of decay in which nucleus changes from a higher energy state to a lower energy state due to the release of electromagnetic radiation.
So we can conclude that In alpha decay, the nucleus loses two protons, in beta decay, the nucleus either loses or gains a proton whereas in gamma decay, no change in proton number occurs only energy is released.
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3. a rocket, initially at rest, is fired vertically with a net upward acceleration of 12 m/s2 . at an altitude of 0.50 km, the engine of the rocket cuts off. a. how long is it in the air?
As a result, the rocket will soar to a maximum height of 0.5 km plus 510.2 m. One kilometre is equal to this. This becomes the beginning velocity for the second stage, and the acceleration in free fall is equal to -g.
0=1002−2×9.8×h
∴h=10,0002×9.8=510.2xm
Is a rocket's acceleration constant?As a result, although there is a constant force acting on the rocket, the resulting acceleration is not constant; rather, it is constantly rising. The amount of fuel burnt will thus have an impact on the rocket's overall change in velocity, and this dependency is nonlinear.
This indicates that the rocket's speed is increasing by 90 m/s every second. This is nine times the gravitational acceleration that is typical.
The space shuttle must accelerate from zero to 8,000 metres per second (almost 18,000 miles per hour) in eight and a half minutes in order to reach the minimum height needed to circle the Earth.
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Which forms of heat transfer do not require matter(particles) to happen? (Select all that apply)
Conduction
Convection
Radiation
None of these
Answer:
Radiation
Explanation:
The form of heat that does not require matter or particles to happen is known as radiation.
Radiation is a form of heat that is carried by electromagnetic spectrum. It does not depend on particles of the medium. Convection and conduction depends on the particles in the medium for heat transfer. Conduction and convection cannot occur in a vacuum. Radiation can transfer heat in a vacuum.describe free fall and weightlessness ?
weightlessness is the complete or near complete absense of the sensation of weight.
when in freefall,the only force acting upon your body is the force of gravity a noun contact force.since the gravity cannot be felt without any other opposing forces,you would have no sensation of it.you would feel weightless when in a state of freefall.
Using the formula, Force = mass'acceleration. (F = m xa)(stated in Newtons (N)). Solve: A water-filled balloon with an overall mass of 1 kg undergoes an acceleration of 2 m/s2. How much force is being applied to the balloon?
Answer:
2N
Explanation:
Given parameters:
Mass of the balloon = 1kg
Acceleration = 2m/s²
Unknown:
Applied force = ?
Solution
According to Newton's second law of motion:
Force = mass x acceleration
Now insert the given parameters and solve;
Force = 1 x 2 = 2N
define direct current
Answer:
DC (direct current) is the unidirectional flow or movement of electric charge carriers (which are usually electrons). The intensity of the current can vary with time, but the general direction of movement stays the same at all times.
Direct current is produced by rectifiers, batteries, generators with commutators, and fuel cells. For example, the current flowing in appliances running on batteries or in a flashlight is a direct current.
A model car company produces battery-powered model cars. At its maximum
acceleration, their latest model accelerates from rest to its top speed in 3.5 s.
a) While the car is travelling at its top speed, it covers 180 m in 9.0 s.
Calculate the car's maximum acceleration.
b) Calculate how fast the car would be moving if it accelerated from rest for 1.5 seconds
with its maximum acceleration.
Answer:
a) 5.714 m/s²
b) 13.33 m/s²
Explanation:
, [tex]\text{The final velocity, }\text{\ensuremath{v_{f}}}\text{ of the car is }\text{\ensuremath{\dfrac{\Delta v}{\Delta t}=}}\dfrac{{180m}}{9.0s}=20\;m/s[/tex]
The car goes from an initial velocity of 0 m/s to this final velocity in t=3.5s
Therefore the acceleration of the car is given by
[tex]\displaystyle a=\boldsymbol{\dfrac{{v}_{f}-{v}_{0}}{t}}[/tex]
where [tex]v_0[/tex] is the initial velocity
[tex]a=\dfrac{20-0}{3.5}=\dfrac{20}{3.5}=5.714\mathrm{m/s^{2}}\[/tex]
Part a
[tex]\text{Maximum\;Acceleration}}}=5.714 \;m/s^{2}[/tex]
Part b)
If the car accelerated from rest and reached final speed of 20 m/s in 1.5s instead of 3.5s then
[tex]a=\dfrac{\boldsymbol{20}}{\boldsymbol{1.5}}={\displaystyle \textbf{13.33}\;m/s^{2}}[/tex]
a window washer does not want to change her position. what does she want the forces acting on her to be? small small balanced balanced unbalanced unbalanced large
She must have a balanced force to act on her.
Balanced forces are forces of opposite direction and equal magnitude. These are considered to be in equilibrium. When the forces are balanced, there is no change in direction.
Therefore, the window washer would like to have a balanced force so that she doesn't fall and will maintain her balance and her position will not change.
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A 90.5-kg cannon is loaded with a 104-gram ball. The cannon is fired and propels the ball forward. A photogate measurement determines that the cannon recoiled backwards with a speed of 20.8 m/s. Determine the speed of the ball.
Answer:
18100 m/s.
Explanation:
conservation of momentum can be applied in solving this question, by using below expresion
mv = MV
where M = mass of recoil of canon =90.5kg
V =velocity of recoil of canon = 20.8 m/s.
m= mass of tennis ball=204g=104x 10⁻³kg
v = velocity of tennis ball
104 x 10⁻³ x v = 90.5 x 20.8
We can make V subject of formula
v = (90.5 x 20.8) / 104 x 10⁻³
v = 18100 m/s.
Hence, the speed of the ball is 18100 m/s.
Why d/dt(a+bt^2)=2bt
Because a is not a function of t .
So d/dt of a is zero.
a electron with an initial speed of 500,000 m/s is brought to rest by an electric field. what was the potential difference that stopped electron? m
The potential difference that stopped electron is 1.422v
potential difference in between two points is the amount of work done is moving a unit charge from one point to another point.
The mass of the electron,
m = 9.109*10⁻³¹
Va (initial speed) = 500,000 m/s
Vb (final speed) = 0 m/s
Electron has been stopped because the electrons move from higher potential to lower potential.
by the work energy theorem
W = ½ mv² (1 equation)
The Potential difference is
W = eV
V = W/e
put the value of W form equation 1.
[tex]V = \frac{\frac{1}{2} (V_{b} ^{2} - V_{a} ^{2} )}{e}[/tex]
e = 9.109*10⁻³¹
V = 1/2 [(500000m/s²) - 0m/s² ] / 9.109*10⁻³¹
V = 1.422v
The potential difference that stopped electron is 1.422v
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Develop a definition of chemical change using the words atoms and molecules in your definition.
Answer:
can you be more espisific
Explanation:
Answer:
a chemical change is a substance change in to a new substance
Explanation:
how can a cell quickly decrease its s/v by decreasing its surface area, while keeping its volume about the same
The surface area to volume ratio declines with cell expansion. This is due to the fact that as a cell expands, its volume (internal contents) develops more quickly than its surface area (its cell membrane). Because the cell membrane needs to have enough surface area for the transfer of materials into and out of the cell, this is an issue for cells. The cell must go through mitotic cell division or cease to function if its volume grows to the point where not enough materials can be carried into and out of it. Cells are so tiny because of this.
A cell's surface area to volume ratio will decrease as its surface area will decrease keeping the volume constant. A cell with a smaller surface area to volume ratio has less plasma membrane and more volume.
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a cube of silver has a mass of 21 kg. calculate the length of the cube's side in inches. the density of silver is 10.49 g/cm3.
the length of the cube's side in inches is 4.96 inches
Density- It is a measurement of that how material is packed together tightly.
Its formula is ρ= m/v
where ρ is the density of material
m is the mass
v is the volume
here we have to find the length of cube's side
a cube of silver has a mass = 21 kg. = 21×10³ [∵1kg = 1000g ]
density of silver = 10.49g/cm³
the length of the cube's side = ?
density is given by
ρ= m/v
to find the volume we rearrange the above equation
v=m/ρ
volume of a cube = (length)³ = l³
using values we get
l³ = 21×10³ /10.49 ≈ 2×10³ cm³
l =∛(2×10³)cm³
l = 1.26 ×10 = 12.6 cm
l = 4.96 inches [∵ 1 cm = 0.394 inch ]
the length of the cube's side in inches is 4.96 inches
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Suppose you fill two rubber balloons with air, suspend both of them from the same point, and let them hang down on strings of equal length. You then rub each with wool or on your hair so that the balloons hang apart with a noticeable separation between them. Make order-of-magnitude estimates of (c) the field each creates at the center of the other
The electric field each creates at the centre of the other is 1.7×10^4N/C.
Consider two balloons of diameter 0.200m each with a mass 1.00g hanging apart with 0.0500m separation on the ends of string making angles of 10.0° with the vertical
E = ke q /r^2
= [(8.99×10^9N⋅m^2C^2)(1.2×10^−7C)] / (0.25m)^2
= 1.7×10^4N/C
Gauss Law states that the total electric flux out of a closed surface is equal to the charge enclosed divided by the permittivity. The electric flux in an area is defined as the electric field multiplied by the area of the surface projected in a plane and perpendicular to the electric field.
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PLEASE HELP AND HURRY IM FOING A TEST Right now
Gamma rays and X-rays are both high-energy forms of radiation that can penetrate the
skin. X-rays, however, are the chosen form of radiation used to take pictures inside our
bodies. Which of the following is a reasonable explanation for the use of X-rays over
gamma rays when taking images?
A The energy and intensity of X-rays can be controlled.|
B X-rays have higher energy than gamma rays.
C The energy and intensity of gamma rays can be controlled.
D Gamma rays have higher energy than X-rays.
Answer: A The energy and intensity of X-rays can be controlled.|
Explanation:
Water at a pressure of 3.00 × 105 Pa flows through a horizontal pipe at a speed of 1.00 m/s. The pipe narrows to one-fourth its original diameter. What is the speed of the flow in the narrow section?
Answer:
The answer is "[tex]16 \ \frac{m}{s}[/tex]"
Explanation:
[tex]Pressure \ (P) = 3.00 \times 10^{5}\ Pa\\\\Velocity\ V_1 = 1.00 \ \frac{m}{s}[/tex]
Using the formula for equating the continuity equation:
[tex]\to V_1 \times A_1 = V_2 \times A_2\\\\\to A_2 = \frac{A_1}{16} \\\\\therefore \\\\\to V_2 = V_1 \times \frac{A_1}{A_2} \\\\\to V_2 = 1 \times 16 = 16 \ \frac{m}{s}[/tex]
The speed of the flow in the narrow section is [tex]16m/s[/tex].
To find the speed of the flow in the narrow section, We use equation of continuity.
[tex]V_{1}*A_{1}=V_{2}*A_{2}[/tex]
Given that , initial speed [tex]V_{1}=1m/s[/tex]
Let us consider that, initial cross-section area is[tex]A_{1}=A[/tex].
When the pipe narrows to one-fourth its original diameter.
Then, Area [tex]A_{2}=\frac{A}{4^{2} }=\frac{A}{16}[/tex]
Substituting values in above equation.
[tex]1*A=V_{2}*\frac{A}{16}\\\\V_{2}=16m/s[/tex]
Hence, the speed of the flow in the narrow section is [tex]16m/s[/tex].
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One long wire carries current 30.0 A to the left along the x axis. A second long wire carries current 50.0 A to the right along the line (y = 0.280m, z = 0). (b) A particle with a charge of -2.00μC is moving with a velocity of 150i Mm/s along the line (y = 0.100m , z=0 ). Calculate the vector magnetic force acting on the particle.
The vector magnetic force on the particle is [tex]3.47 \times 10^{-2}{~}\hat{j}{~} N[/tex].
A stream of charged particles, such as electrons or ions, traveling through an electrical conductor or a vacuum is known as an electric current.
One long wire carries a current I = 30.0 A to the left along the x-axis. I' = 50.0 A of current is being carried by a second lengthy wire to the right along the line (y = 0.280 m, z = 0).
Now,
The charge of a particle is -2.00μC which is moving with a velocity of v = [tex]150\hat{i} {~}Mm/s[/tex].
At y = 0.1 m the total magnetic field will be:
B = [ μ₀ (I') / 2πr ] + [μ₀ (I) / 2πr]
[tex]B = [\frac{\mu_{0} }{2 \pi}] \times( \frac{50}{0.28-0.1} (-\hat{k})] + \frac{30}{0.1}(-\hat{k})[/tex]
B = 1.16 × 10⁻⁴ T
Then the force on the particle is:
F =q(v × B)
[tex]F = (-2 \times 10^{-6} ) ( 150 \times 10^{6})\hat{i} \times (1.16 \times 10^{-4})(-\hat{k})[/tex]
F = 3.47 × 10⁻² N
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