Answer:
1800 N
Solution:
Impulse = mΔv = m * (u - v) .
here m = 100 kg
u = 4 m/s
v = -5 m/s
impulse = 100 x ( 4 - ( -5 ) ) = 900 Kg m/s .
Average reaction Force ( Favg ) = impulse / Δt
Average reaction Force ( Favg ) = 900kg·m/s / 0.5s
Average reaction Force ( Favg ) = 1800 N
help pls 30 points need help
Answer:
C
Explanation:
Answer:
I believe the answer is C.
Explanation:
Nia has $19.50 to ride the subway around New York. It will cost her $0.75 every time she rides. Identify the dependent variable and independent variable in this scenario.
A The number of rides and the total cost are both independent variables.
B The number of rides and the total cost are both dependent variables.
C The number of rides is the independent variable, and the total cost is the dependent variable.
D The total cost is the independent variable, and the number of rides is the dependent variable.
Answer:
C The number of rides is the independent variable, and the total cost is the dependent variable.
Explanation:
The total cost is the dependent variable, because it depends on the number of rides. The number of rides is the independent variable; it is the variable that Nia controls.
help me please, help me
for the question w the coffee cup and the dishwasher: 19,536.72 J
for the question w the 3 pots of boiling water: They all have the same temperature
for the question w the copper: 103.84 Celsius
(Not sure what the other 2 pictures are about but good luck)
Help me pls I'm struggling
Answer:
2. The temperature doubles.
014) 48.6 J
015) 13,700 J
016) 5.94×10⁻²¹ J
Explanation:
PV = nRT
P and n are constant.
nR/P = k
V/T = k
If the volume doubles, the temperature also doubles.
014) The kinetic energy per atom is:
KE = 3/2 kT
KE = 3/2 (1.38×10⁻²³ J/K) (21 + 273) K
KE = 6.09×10⁻²¹ J
The total kinetic energy is:
KE = (6.09×10⁻²¹ J) (7.99×10²¹)
KE = 48.6 J
016) The kinetic energy per atom is:
KE = 3/2 kT
KE = 3/2 (1.38×10⁻²³ J/K) (14 + 273) K
KE = 5.94×10⁻²¹ J
015) The total kinetic energy is:
KE = (5.94×10⁻²¹ J) (3.82 mol) (6.02×10²³ atom/mol)
KE = 13,700 J
Ice sinks in methanol, but floats on water. From this we can conclude: A The density of ice in methanol must be different from that in water. B The density of water must be less than the density of methanol. C The density of ice must be greater than the density of water. D The density of methanol must be less than the density of water.
Answer:
D The density of methanol must be less than the density of water.
Explanation:
Ice sinks in methanol, so the density of ice is greater than the density of methanol.
Ice floats in water, so the density of ice is less than the density of water.
Since the density of ice is the same in each case, the density of methanol must be less than the density of water.
ρ_methanol < ρ_ice < ρ_water
A boy on a chairlift moving parallel to the mountain slope at a speed of +15 m/s watches a skier going straight down the mountain with a speed of -35 m/s. What is the velocity of the skier relative to the chairlift? A. -50 m/s B. -35 m/s C. -20 m/s D. +15 m/s E. +50 m/s
Answer:
A. -50 m/s
Explanation:
Given
Velocity of Chairlift = +15m/s
Velocity of Skier = -35m/s
Required
Determine the velocity of the skier relative to the chairlift
Basically, relative velocity is the difference between the two velocities;
Having said that;
Relative velocity of the skier relative to the chairlift = Velocity of the Skier - Velocity of the Chairlift
Relative velocity of the skier relative to the chairlift = -35m/s - (+15m/s)
Open bracket
Relative velocity of the skier relative to the chairlift = -35m/s - 15m/s
Relative velocity of the skier relative to the chairlift = -50
Five equal negative charges are uniformly spaced in a semicircular
arc of radius ro with its center at the origin. The charges positions in
polar coordinates are given by (o. 6.), where the values of 0 are 0°,
45°, 90°. 135º. and 180°. At the position (x, y) = (ro, -ro) in the 4th
quadrant, which statement best describes the direction of the
resulting electric field?
The direction is that of a 3rd quadrant angle.
The direction is that of a 2nd quadrant angle.
The direction is that of a 1st quadrant angle.
The direction is that of a 4th quadrant angle.
Answer:
The direction is that of a 3rd quadrant angle
Explanation:
when you have 2 45 angles it equals to 90 then with the 90 we multiply by 2 due to the 2 adjacent angles equating to 180 which swings it to the 3rd quadrant angle
Write a report on the lap experiment: Motion with Constant Acceleration
Answer:
Purpose: To observe how an object’s position and velocity change while it is moving with a constant acceleration.
Question: How does an object’s position and velocity change as the object accelerates?
Hypothesis: If the fan speed increases, then the acceleration of the cart increases, because a greater fan speed supplies more energy to move the cart.
Variables:
• Independent variable: fan speed
• Dependent variable: acceleration of the cart
• Controlled variables: mass
Materials:
• Cart with Fan (1 kg)
• CM ruler (1 cm)
• Stop watch (0.0 cm pe sec)
• Flag
Procedure:
1. Use the setup on “Force and Fan Carts” Gizmo.
2. First, put the fan speed on low and no friction surface.
3. Press the start button and record the final time when the cart crosses the finished line. Record on table B.
4. Then, click on the data tab to record the speed data, total distance, average velocity, and acceleration. Record on table A and B.
5. After, observe the position vs. time graph with the speed and line graph toggled. Record on table C.
6. Repeat steps 2-5 on fan speed on medium and high with no friction surface.
7. Next, reset and put fan speed on low.
8. Press start and pause on 4 seconds.
9. On the same trial turn off the fan speed and hit start again.
10. Observe the graph and write observations on table D.
Analysis and Conclusion:
In conclusion, my hypothesis matches the data, because the data shows that increasing the fan speed increases the acceleration of the cart. The trends for all fan speeds are linear slope for speed. The higher the fan speed, the less time it took for the cart to cross the finish line.
Data:
Explanation:
Sorry can’t copy and paste results
Answer:
for that pervious answer why cant we copy and paste?
Explanation:
You are in a desert on a hot day and see water in the distance. It is not really there, you see it because light bends due to a difference in the temperature of air. Which behavior of light best explains this? Select one: a. reflection b. translocation c. diffraction d. refraction
Answer:
d) refraction
Explanation:
in physics, refraction is the change of direction of a wave passing from one medium to another. refraction of light is the most commonly observed phenomenon but other waves such as sound waves and water waves also experience refraction
Answer:
B. Translocation
Explanation:
It means a change in location. It often refers to genetics, when part of a chromosome is transferred to another chromosome, you want a change in location because you are so thirsty in the desert and need water
Distinguish between resultant and equilibrant forces
Answer:
resultant is a single force that can replace the of a number of forces , equililbrant is a force that is exactly opposite to resultant
Explanation:
If the angle of incidence of a light source to a shiny surface is 30 degrees, what will the angle
of reflection be?
150 degrees
90 degrees
60 degrees
30 degrees
Angle of incidence always equals angle of reflection. Think of a tennis ball being hit into a wall. The ball will bounce off at the same angle that it approached with. The angles mentioned are formed through the line called the "normal", which is the line perpendicular to the surface.
When do we use v=2s/t and what does that equation mean?
Answer:
This can be used to find out the speed of the returned journey. The equation means speed = returned distance ÷ time.
Explanation:
Changes in which property are heard when the Doppler effect occurs? pitch amplitude volume wavelength
Changes in pitch are heard when the Doppler effect occurs.
What is the Doppler effect?The Doppler effect, also known as the Doppler shift, is a term used to explain changes in frequency caused by moving sources of sound or light with regard to an observer.
The Doppler effect is the apparent change in frequency or wavelength of a wave that is perceived by an observer when the source of the wave or the observer is moving relative to each other.
In the case of sound waves, if the source of the sound is moving towards the observer, the frequency of the sound waves is perceived to be higher, resulting in a higher-pitched sound.
Conversely, if the source of the sound is moving away from the observer, the frequency of the sound waves is perceived to be lower, resulting in a lower-pitched sound.
This effect can be observed in many everyday situations, such as the changing pitch of a siren as an ambulance or police car passes by.
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Answer:
option A) pitch
Explanation:
2023 :)
PLZ ANSWER ASAP, I WILL MARK AS BRAINLIEST
Answer:
electric potential energy=
[tex]\frac{KQq}{r} [/tex]
so the electric potential energy and distance(r) are inversely proportional.
then, the greatest energy occur in the smallest distance b/n the two balloon.
Answer:
Top Left
Explanation:
The two balloons would create enough friction and energy to separate from each other as two balls of air would push each other from their energy
Help me please, MathPhys be my hero :)
Answer:
T = 261 K
T = -12.2°C
Explanation:
PV = nRT
If P and n are constant:
V / T = V / T
2.75 L / (273.15 + 21) K = 2.44 L / T
T = 261 K
T = -12.2°C
At summer camp, the swimming course runs the length (L) of a small lake. To determine the length of the course, the camp counselors measure the two "dry" legs of a right triangle. What is the length in meters of the swimming course in the figure below?
Answer:
47 m
Explanation:
Data obtained from the question include the following:
Length of dry leg 1 (L1) = 40 m
Length of dry leg 2 (L2) = 25 m
Length of swimming course (L) =..?
The length of the swimming course can be obtained by using pythagoras theory as shown below:
L² = L1² + L2²
L² = 40² + 25²
L² = 1600 + 625
L² = 2225
Take the square root of both side.
L = √2225
L = 47.1 ≈ 47 m
Therefore, the length of the swimming course is approximately 47 m.
Label the parts of the brain. medulla oblongata thalamus cerebrum cerebellum brain stem pons hypothalamus midbrain
Answer:
Medulla oblongata is lower part of brain.
Cerebrum and cerebellum are the upper hemispheres of the brain.
Explanation:
Cerebrum is the largest part of the brain and is composed of right and left hemispheres.
Cerebellum is the part of brain that lies inside the cerebellum.
Medulla Oblongata is lowest part of brain stem which is most vital part of the brain.
Thalamus is a small region of the brain located above the brain stem. Its main function is to transmit sensory signals to cerebral cortex.
Brain stem act as relay center connecting the cerebrum and cerebellum to the spinal chord.
Hypothalamus is the mid brain located near the pituitary glands. It is very small region of the brain but it plays an important role in maintaining the body temperature and releasing the hormones.
Answer:
Medulla oblongata: The bottom part of the brainstem helps regulate your breathing, heart rhythms, blood pressure and swallowing.
Explanation:
Which of the following is an accurate statement? A. Step-up voltage transformers have fewer turns in the primary that in the secondary winding. B. aC generators produce current that's pulsating but always remains positive C. Step-down voltage transformers have a different number of turns in the primary than in the secondary winding, so they change the incoming collage to a higher voltage D. DC generators produce current with a voltage that changes from positive to negative
Answer:
Option A is an accurate one.
Explanation:
A transformer being considered as a step-up transformer during which the performance (supplementary) voltage becomes stronger than that of the input (main) impedance of it. This kind of transformer reduces the electrical output to constantly keep the product input as well as power consumption equivalent.The other provided alternative is not related to the information provided there. So the response to the above seems to be the correct one.
Help me please, help
Answer:
455,000 Pa
Explanation:
PV = nRT
If n is constant:
PV / T = PV / T
(101,325 Pa) (718 mL) / (273 K) = P (175 mL) / (26 + 273) K
P = 455,000 Pa
What's true about the elliptical path that the planets follow around the sun?
A)
A line can be drawn from the planet to the sun that follows the same curve as the
ellipse.
B)
A vector can be drawn from the center of one planet to the center of an adjacent
planet.
C)
A line can be drawn from the planet to the sun that sweeps out equal areas in equal
times.
D)
A scalar can be measured from the angle that the planet travels relative to the sun's
orbit.
* explain in your own words the phrase ,
'' a cell has a voltage of 1.5V''
plz help!!
Will give the brainliest!
plz answer correctly.
First of all, what is a cell?
A cell is a power source. It converts chemical energy into electrical energy which then allows a current to flow.
Then, what is a voltage?
A voltage is an electrical force required to push an electric current.
The answer to your question
The powers source requires a voltage of 1.5 to push the electrical current around the circuit
A ball is thrown directly downward with an initial speed of 8.05m/s, from a height of 30.2m. After what time interval does it strike the ground?
Answer:
2.9 seconds
Explanation:
The time we must take is positive since it has a valid physical answer, The negative one stands for traveling to the past something still we are unable to do.
Why does precipitation occur after water condenses in clouds?
Answer:
Precipitation forms in the clouds when water vapor condenses into bigger and bigger droplets of water
Explanation:
Precipitation forms in the clouds when water vapor condenses into bigger and bigger droplets of water. When the drops are heavy enough, they fall to the Earth. If a cloud is colder, like it would be at higher altitudes, the water droplets may freeze to form ice.
Precipitation forms in the clouds when water vapor condenses into bigger and bigger droplets of water. When the drops are heavy enough, they fall to the Earth.
Help me please, I need it
Answer:
3000 m/s
Explanation:
The kinetic energy is:
KE = 3/2 kT
where k is Boltzmann constant and T is absolute temperature.
Kinetic energy is also:
KE = 1/2 mv²
where m is the mass and v is the speed.
1/2 mv² = 3/2 kT
mv² = 3kT
v = √(3kT / m)
v = √(3 × 1.38×10⁻²³ J/K × (273 + 27) K / 1.38×10⁻²⁷ kg)
v = 3000 m/s
Please help, I need you, please help me
Answer:
14 mL
Explanation:
Ideal gas law:
PV = nRT
If n is constant, then:
PV / T = PV / T
(0.819 atm) (17.9 mL) / (273 + 28) K = (0.99 atm) V / (273 + 13) K
V = 14 mL
Plz Help me with this
Answer:
Cools ; size
Explanation:
The rate at which magma cools determines the size of the crystals in the new rock. Igneous rocks are formed from the cooling and solidification of molten magma which finds its way to the surface or depth of very low pressure beneath the surface. This place or depth of cooling of magma affects the cooling rate and hence the size of the crystals formed. Igneous rocks formed at depths below the surface have more time to cool and allows more time for Crystal growth and hence produce coarse grained crystal grains called Intrusive igneous rocks which have significantly larger crystals than those formed on the surface which cools rapidly and allowing very little time for crystal growth giving rise to the formation of fine grained crystals and are called extrusive igneous rocks.
When very electronegative atoms, like oxygen, bond to atoms with a lower
electronegativity, like hydrogen, what's the result?
O A. The oxygen atom becomes strongly positive.
O B. The oxygen atom becomes strongly negative.
O C. The hydrogen atom becomes partially positive.
O D. The hydrogen atom becomes partially negative.
Answer:
Explanation:
B the oxygen atom becomes strongly positive
and
C HE HYDROGEN ATOM BECOMES PARTIALLY POSITIVE
PLS MARK MY ANSWER AS THE BRANLIEST
Help me please, please !
Answer:
b and d
a, c, e, and f
Explanation:
Ideal gas law:
PV = nRT
Solving for temperature:
T = PV / (nR)
Therefore, temperature is directly proportional to pressure and volume, and inversely proportional to the number of molecules.
T = k PV / N
Let's say that T₀ is the temperature when P = 100 kPa, V = 4 L, and N = 6×10²³.
a) T = k PV / N = T₀
b) T = k (2P) V / N = 2T₀
c) T = k (P/2) (2V) / N = T₀
d) T = k PV / (N/2) = 2T₀
e) T = k P (V/2) / (N/2) = T₀
f) T = k (P/2) V / (N/2) = T₀
b and d have the highest temperature,
a, c, e, and f have the lowest temperature.
Which types of waves requires matter to carry energy? electromagnetic waves only mechanical waves only electromagnetic and mechanical waves longitudinal and electromagnetic waves
Answer: Mechanical waves
Explanation:
Mechanical waves require a medium in order to transport their energy from one location to another. A sound wave is an example of a mechanical wave. Sound waves are incapable of traveling through a vacuum.
Answer:
Mechanical waves
Explanation:
edge 22'
0
Which of the following can you conclude about a particle labeled
Check all that apply.
O A. It has one electron.
OB. It has one neutron.
I C. It has one nucleon.
O D. It has one proton.
E. It is negatively charged.
OF. It is an alpha particle.
O G. It is a beta particle.
Answer:
B and C
Explanation:
The given symbol [tex]_{-1}^{0}e[/tex] denotes an electron. An electrons has neglecting mass and has one unit of negative charge. Thus, option A is correct.
What is an electrons?An electron is a subatomic particle. the other subatomic particles that constitutes an atom are neutrons and protons. neutrons and protons are located inside the nucleus and electrons are revolving around the nucleus through circular paths of fixed energies.
Electrons are having negative charge and protons are positively charged particles. For an atom the number of protons and electrons are the same. Therefore, an element in its atomic state is neutral.
Neutrons are neutral. However both neutrons and protons are having significant mass compared to an electrons. Hence, the representation of electrons include zero mass and -1 charge. Hence, option A is correct.
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