Answers
Related Questions
A
car accelerates from rest at 4.5 m/s² for 3 seconds.
a. What is the car's velocity after 3 seconds?
b. What distance does the car travel in the 3 seconds?
m/s
Answers
A car accelerates from rest at 4.5 m/s² for 3 seconds, the car's velocity after 3 seconds is 13. 5 m/s
The distance the car travel in the 3 seconds is 40. 5m/s
The first equation of motion is v = u + a t. It explains the relationship between velocity and time.
V = Final velocity
u = Initial velocity
a = acceleration
t = time.
How to determine the velocity
When an object is brought to rest or moves from resting, U, initially velocity equals 0.
From the formula,
V = u + at
V = ?
u = 0, because the object was at rest.
a = 4. 5 m/ s²
t = 3 seconds
Velocity, V = 0 + 4. 5 × 3
Velocity , V = 0 + 13. 5
Velocity, V = 13.5 m/s²
How to determine the distance
Velocity = Distance ÷ time
Velocity, V = 13. 5 m/s²
time = 3 seconds
distance = ?
Distance = Velocity × time
Distance = 13. 5 × 3
Distance = 40. 5 m
Therefore, the car's velocity after 3 seconds is 13. 5 m/s² and the distance the car travels after 3 seconds is 40. 5m
If an amount of heat Q is needed to increase the temperature of a solid metal sphere of diameter D from 4°C to 7°C, the amount of heat needed to increase the temperature of a solid sphere of diameter 2D of the same metal from 4°C to 7°C is
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Answer:
Q = c M ΔT where c is the heat capacity and M the mass present
Q2 / Q1 = M2 / M1 since the other factors are the same
M = ρ V where ρ is the density
M = ρ Π (d / 2)^2 where d is the diameter of the sphere
M2 / M1 = (2 D/2)^2 / (D/2)^2 = 4
It will take 4Q heat to heat the second sphere
A train moving west with an initial velocity of 20 m/s accelerates at 4 m/s' for 10 secon
moves a distance of
a
meters.
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Answer:
Distance of 400m.
Explanation:
Use your kinematics equation to solve for distance (we can use kinematics b/c acceleration is constant).
d = (initial velocity x time) + 1/2 at^2
d = (20 x 10) + 1/2 (4) (10)^2
d = 200 + 200
d = 400 m
If a sound wave has a wavelength of 7 m and travels at a speed of 330 m/s, what is the
frequency of the sound?
O 47.1 hz
O2.12 hz
2.31 hz
23.1 hz
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Answer:
047.1
Explanation:
frequency equals velocity over lambda
Two identical pucks of equal but unknown mass head straight towards each other with velocities
of 8.0 m/s and -6.0 m/s. They collide and stick together. What is their resulting velocity?
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inelastic collision
m.8 - m.6 = 2mv'
2m = 2mv'
v' = 1 m/s
Answer:
1 m/s
Explanation:
According to the Law of Conservation of Momentum, (for inelastic collisions)
v = m₁v₁ + m₂v₂ / m₁ + m₂v = 8m - 6m / 2mv = 2m/2mv = 1 m/sWhich statement is true about this magnet and nails?
The nails are permanent magnets.
Both the magnet and the nails are permanent magnets.
Both the magnet and the nails are temporary magnets.
The nails are temporary magnets.
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Answer: The nails are temporary magnets.
Explanation:
A permanent magnet is a magnet that will stay magnetized, while a temporary magnet will lose magnetism.
The magnet here is a permanent magnet, so the "Both the magnet and the nails are temporary magnets." option is incorrect.
The nail is a temporary magnet, so this narrows the options down to our answer;
The nails are temporary magnets.
You can read more here: https://brainly.com/question/2841288
Why are current and resistance kept very low?
A. To prevent excess heat.
B. Because the voltage is also quite low.
C. Both A. and B.
D. None of the above.
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Answer:
I think the answer is B.
Explanation:
If the resistance is too high, the current will be low even if the voltage is enough.A small object with a mass of 1 kg moves in a circular path with a constant speed of 5 m/s. What is the change in momentum during 1⁄2 of period; one period?
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The change in momentum of the object during the half period is -10 kgm/s.
The change in momentum of the object during the one period is 0.
Change in momentum of the object during ¹/₂ period
The change in momentum of the object during the half period is calculated as follows;
ΔP(¹/₂) = Pf - Pi
where;
Pf is final momentumPi is the initial momentumΔP(¹/₂) = (-5 x ) - (5 x 1)
ΔP(¹/₂) = -10 kgm/s
Change in momentum of the object during 1 periodΔP(1) = Pf - Pi
ΔP(1) = (5 x 1) - (5 x 1) = 0
Learn more about change in momentum here: https://brainly.com/question/7538238
#SPJ1
(100 POINTS AND BRAINLIEST)
1. When elements form a molecule, what is true about the oxidation numbers of the atoms in the molecule?
a. The sum of the oxidation numbers must equal zero.
b. All oxidation numbers from the same molecule must be positive.
2. True or False: All oxidation numbers from the same molecule must be negative.
a. True
b. False
3. Which of the following elements will bond with oxygen resulting in a 1:1 ratio of oxygen and the element?
a. lithium
b. boron
c. beryllium
d. nitrogen
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Answer:
1. a
2. b (FALSE)
3. c (beryllium)
Explanation:
Answer:
the answer for number one is A. number 2 is B. and number 3 is C.
Explanation:
theys a Quizlet made on these three questions already so I just got it from there. they should be correct pls let me know if they are.
A force of 400N acts on a body for time 10ms impulse will be
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Answer:
4000Ns
Explanation:
I=F×T=400N×10ms
the importance of organs of nervous system
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Explanation:
The nervous system transmits signals between the brain and the rest of the body, including internal organs. In this way, the nervous system's activity controls the ability to move, breathe, see, think, and more.
what amount of heat is needed to raise 52.3g of water by 12 c
Answers
Answer:
2.73 kJ
Explanation:
yan po I hope it's help po pa brainly na lng po
-10m/s² and vertical height of 0.6m.How will we use this information to find the velocity of the falling object?