Answer:
here we go
Explanation:
[tex]density \: = mass \div volume \\ mass \: = density \times volume \\ \\ but \: our \: volume \: is \: in \: cubic \: metres \\ convert \: it \: to \: cubic \: centimeters \\ volume \: = 25 \div {(100)}^{3} \\ = 2.5 \times 10^{ - 5} cm^{3} \\ \\ mass = 11 \times (2.5 \times 10 ^{ - 5} ) \\ = 2.75 \times 10 ^{ - 4} grams[/tex]
give me a brainliest atleast
What is equilibrium
pls answer i know but need to confirm
Answer:
a state in which opposing forces or influences are balanced.
Explanation:
Answer: A state of balance between two forces
Explanation: hope this helps!
A horizontal uniform 1.20-N meter stick is held up by two vertical strings, one at the 20-cm mark and the other at the 60-cm mark. What is the tension in the string at the 60-cm mark
The tension in the string at the 60-cm mark will be 0.9 N.The tension force is applied along the whole length of the wire, pulling energy equally on both ends.
What is tension force?The tension force is described as the force transferred through a rope, string, or wire as it is pulled by opposing forces.
The given data in the problem is;
The length of the stick is, L= 1.20 m =120 cm
T is the tension in the string at the 60-cm mark;
T₁ is the tension at the 20-cm mark
From the torque equilibrium law;
[tex]\rm mg(30)-T_2(40)+T_2 (40) =0 \\\\\ T_1(0)=mg (30)\\\\\ T_2(40)=1.2 (30) \\\\ T_2= 0.9 \ N[/tex]
Hence the tension in the string at the 60-cm mark will be 0.9 N.
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A 22 ohm resistor and a 33 ohm resistor are connected in series and placed across a 120-v potential differance
a. What is the equivalent resistance of the circuit?
b. What is the current in the circuit?
c what is the voltage drop across each resistor?
d what is the voltage drop across the two resistors together?
Answer:
Explanation:
Part A
Resistances in Series Add
Rt = R1 + R2
Rt = 33 + 22
Rt = 55 ohms
Part B
Current is found by using ohms law
I = E/R
E = 120 volts
R = 55 ohms
I = 120/55
I = 2.18
Part C
a)E = I * R
E = ?
I = 2.18
R = 22 ohms
E = I * R
E = 2.18 * 22
E = 48 volts when I is not rounded in Part B
b)E = I * R
E = ?
I = 2.1818...
R = 33
E = 2.181818... * 33
E = 72 when the repeating decimal is allowed to repeat.
Part D
The total voltage drop across both resistors adds
E = 72 + 48
E = 120 Volts
Your favorite radio station broadcasts at a frequency of 83.8 MHz with a power of 16.5 kW. How many photons does the antenna of the station emit in each second
For a radio station broadcasts at a frequency of 83.8 MHz with a power of 16.5 kW, the number of photons is mathematically given as
P=6.92*10^{29}photon/sec
What is the number of photons does the antenna of the station emit in each second?Generally, the equation for the energy is mathematically given as
E=hf
Therefore
E=6.63*10^{34}*83*10^6
E=5.561*10^26J
In conclusion, the number of photons
P=dN/dt
P=38500/5.561*10^{26}
P=6.92*10^{29}photon/sec
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What is the net force and direction the box will move in ?
Answer:
5 Newton to right direction
Explanation:
5N to the right will be vanishes with 5N to the left..... then the another 5N to right will be the force that move the box
What is the fundamental frequency of a
guitar string when the speed of waves on
the string is 115 m/s and the effective string
length is 0.720 m?
Answer quickly if possible
Answer:
dk
Explanation:
sorry jus rlly not that smartHello people ~
A hollow metal sphere of radius 5 cm is charged so that the potential on its surface is 10 V. The potential at the centre of the sphere is
(a) 0 V
(b) 10 V
(c) Same as at point 5 cm away from the surface
(d) Same as at point 25 cm away from the surface
Answer:
10V
Explanation:
Hollow sphere means two spherical surfaces inside
So charge on the surface =Charge at any point in sphere i.e voltage remains constant.
So
potential at centre=Potential at surface=10V
Option B is correct
Hello people ~
Consider a uniform electric field in the z-direction. The potential is a constant
(a) for any x for a given z
(b) for any y for a given z
(c) on the x-y plane for a given z
(d) all of these
All of the above
As it's given that
A uniform electric field in the z directionMeans the plane it's perpendicular to it xy plane.
It's for any x and any yHence all are correct
Answer:
(d) all of theseExplanation:
It is given that the electric is uniform in the z-direction.
Therefore,
For any x for a given z, the potential will be constantFor any y for a given z, the potential will be constantOn the x-y plane for a given z, the potential will be constantAll of them are correct, so the correct option is dThe force of gravity on a 60 kg woman is 588 N. The woman also exerts a gravitational force on
the Earth. How large a force is this?
Answer:
the same 588 N
Explanation:
Continuing from the previous question, the coefficient of kinetic friction between block A and the tabletop is closest to:
A kinetic friction simply means the force that is in the opposite direction to the body's movement.
What is kinetic friction?Your information is incomplete. Therefore, an overview of kinetic friction will be given. Kinetic friction simply means an inhibitory force that's present when an object begins to move.
In this case, a kinetic friction simply means the force that is in the opposite direction to the body's movement that slides with respect to the surface.
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17. An ambulance at rest blows a siren of frequency 700 Hz. A vertical reflecting board
which is moving at constant velocity 4 ms¹ towards the ambulance. How many beats
per 5 seconds can be heard by the driver in the ambulance?
(The speed of sound is 350 ms ¹)
Answer:
In this case the board is moving towards the observer so the board will receive the frequency as a moving observer
The board then emits the sound received and becomes a moving source according to the driver in the ambulance
f' = f (V + Vo) / V where V is the speed of sound and f' is the frequency received by the moving board
Now the board becomes a moving source and
f' = f (V / (V - Vs) and V is again the speed of sound
Combining these equations we get
f = (V + Vo) / (V - Vs) = 700 (350 + 4) / (350 - 4) = 716 / s
The driver would hear 16 beats / sec
Note: one can do these separately
f' = 700 * (350 + 4) / 350 = 708 frequency received for moving observer
f' = 708 * 350 / (350 - 4) = 716 / sec moving source stationary observer
Every 5 sec one would hear 5 * 16 = 80 beats
It takes 2.5 minutes for sunlight to reach Mercury. How far is Mercury form the Sun, in meters?
A. 7,200,000,000
B. 110,000,000,000
C. 144,000,000,000
D. 45,000.000.000
E. 3.000,000,000
F. 13,000,000
G. 120.000.000
H. 250,000.000.000
Answer:
Its 57.723 billion meters but D is the closest to that.
A conductor differs from an insulator in that a conductor.
Answer:
has free electrons
Explanation:
A conductor has free electrons while an insulator does not. Free electrons are electrons which are not bounded tightly to their parent atoms, and are free to move given the right conditions (ie. a strong EM field).
which statement below can be made about the production of electricity in a nuclear reactor
Answer:
Heat flows from the reactor to the water
Explanation:
Good luck! :)
Why do some quasars have red shifts greater than 1?.
Answer:
They are very distant.
Explanation:
With relativistic red shifts that take into account dilation of space-time, as Einstein predicted.
Pls answer need help
Answer:
See below
Explanation:
Find the NET forces on the objects
A 20==>
B 0
C 30==>
D 15==>
So biggest accel = C because it has the most force acting on it
next is A because it has the next biggest force
next is D then B ...B has no net force acting on it
a graph for horizontal position vs gravitational potential energy represents which of the following
(a) represent the slope of a track
(b) represent opposite of slope of track
(c) a linear relationship
Answer:
this may not be what you're looking for but here you go
Explanation:
A horizontal line means the object is not changing its position - it is not moving, it is at rest. A downward sloping line means the object is returning to the start. Speed-Time graphs are also called Velocity Time graphs. Speed-Time graphs look much like Distance-Time graphs.
State 'True' or 'False'. Rewrite the false statements correctly.
1.The body at terminal velocity will have less weight than the drag force.
2.The line of gravity is always within the base of support of the body in stable equilibrium
3.The force that accelerates a falling body is the force of friction.
Answer:
1. False
Corrected statement: The body at terminal velocity will have equal weight to the drag force.
2. True
3. False
Corrected Statement: The force that accelerated a falling body is the force of gravity.
Explanation:
1. This statement is false. Terminal velocity occurs when the magnitude of the drag force is equal to the magnitude of the force of gravity. This causes zero net force, meaning zero accleration and the object is at its maximim (terminal) velocity.
2. True - if a body is in stable equilibrium, the line of grvaity must be within the base of support.
3. A falling body towards the center of a planet is caused by the force of gravity.
4. Surface waves in an earthquake cause damage and destruction by shaking the ground up and down. They are an example of which type of waves:
a. Electromagnetic waves
b. Transverse waves
c. Standing waves
d. Compression waves
Standing waves is the perfect answer for this
What is the discharge of a stream that is one meter deep, two meters wide, and has a water flow of 5 meters per second
Answer:
10 m^3 /s
Explanation:
1 m X 2 m X 5 m /s = 10 m^3/s
A disk-shaped platform has a known rotational inertia. The platform is mounted on a fixed axle and rotates in a horizontal plane, as shown above. A student wishes to determine the frictional torque exerted on the platform by the axle as the platform rotates. The student has access to equipment that would usually be found in a school physics laboratory.
The quantities that can be measured from the disk-shaped platform include mass, radius for moment of inertia, and rotational frequency for omega.
What is Inertia?It should be noted that inertia simply means the property of all matter by which they tend to remain in constant and uniform motion unless they're acted by an external force.
In this case, the quantities that can be measured from the disk-shaped platform include mass, radius for moment of inertia, and rotational frequency for omega.
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A crane lifts a steel grider in 45s.it required the crane to do 8750000 j of work .how much power did the crane use
Answer:
[tex]194.44kw[/tex]
Explanation:
[tex]power = \frac{workdone}{time \: taken} [/tex]
[tex] p = \frac{8750000}{45} [/tex]
[tex]p = 194444.44watt[/tex]
[tex]p = 194.44kw[/tex]
A tuning fork is struck and produces a sound. The wavelength of this
sound is 2.5 m and the period of this sound is 0.25 s. Find the
frequency of the sound wave and the speed of the wave.
Answer:
Speed= 10meters per second, Frequency = 4hz
Explanation:
First we need to find the frequency of the wave. The formula for frequency is: f (frequency) = 1 / T (period). This means we need to convert the period into seconds and then use it as a denominator with one on the numerator.
Since the period is 0.25,
1/0.25= 4hz
Now, we just need to multiply the frequency with the wavelength
4hzx2.5= 10
= 10 meters per second
What is sliding friction?
A. When two solid surfaces slide past one another.
B. When air, water, or oil flow next to a solid.
C. When an object rols across a surface.
D. When objects move through water.
Answer:
I think the answer would be B
Explanation:
Hope this helps:)...if it's wrong I'm sorry for wasting your time and may God bless you:)
Describe what voltage is
Answer:
electrical 'pressure' measurement
Explanation:
Why do asteroids and comets differ in composition?.
Asteroids are made up of metals and rocky material, while comets are made up of ice, dust and rocky material. Both asteroids and comets were formed early in the history of the solar system about 4.5 billion years ago.
what is the mass of an object if a force of 2N and gives it an acceleration of 2 m/s2
Answer:
1kg
Explanation:
Use the formula
F=ma
m=F/a
m=2N/2m/s^2
m=1kg
Describe two ways that venus does not follow the patterns of the other inner planets.
Following are the ways that Venus does not follow the patterns of the other inner planets because Venus lacks life and water oceans, like does Earth.
What are inner planet?Mercury, Mars , Earth,and Venus and are known as inner planets because their surfaces are compact and rocky, similar to Earth's terra firma.
Venus and the other inner planet are pretty different as well. Following are the ways that Venus does not follow the patterns of the other inner planets are;
1. Venus has an atmosphere that is nearly 100 times thicker than Celestial bodies with extremely heated surface temperatures.
2. Venus lacks life and water oceans, like does Earth.
3. In comparison to Earth and the other planets, the Venus rotates backwards.
Hence, Venus does not follow the patterns of the other inner planets.
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Which term best describes the form of beryllium shown
Answer:
✓ Ion
Explanation:
Which term BEST describes the form of beryllium shown? Protons=4 Neutrons=5 Electrons=2
✓ Ion
What is the relative motion if there were two marbles traveling next to each other at different speeds?
Answer:
v1-v2 is motion of m2 relative to m1 v2-v1 is motion of m1 relative to m2
Explanation: