1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
sleet_krkn [62]
3 years ago
13

A moving car has kinetic energy. If it speeds up until it is going four times faster than before, how much kinetic energy does i

t have in comparison?
Physics
1 answer:
Eva8 [605]3 years ago
7 0
<h2>Ratio of final kinetic energy to initial kinetic energy is 16.</h2>

Explanation:

Kinetic energy , KE = 0.5mv²

Here car speeds up to four times the initial speed, we need to find ratio of final kinetic energy to initial kinetic energy.

Final speed = 4 x Initial speed = 4v

Initial KE = 0.5mv²

Final KE = 0.5 x m x (4v)²

Final KE = 16 x 0.5 x m x v²

Final KE = 16 x Initial KE

Ratio of final kinetic energy to initial kinetic energy is 16.

You might be interested in
Why does a stationary electromagnet attached to an AC source induce current in a wire coil?
lora16 [44]
This is basically Michael Faraday's law and this is known as electromagnetic induction


That's all I know
4 0
3 years ago
the shock absorbers in a car act as a big spring with k= 21900 N/m. when a 92.5 kg person gets in, how far does the spring stret
r-ruslan [8.4K]

Answer: 0.04139m

Explanation:

First, we need to calculate the weight of the man which will be:

Weight = mass × acceleration due to gravity

Weight = mg

Weight = 92.5 × 9.8

Weight = 906.5N

Then, we calculate the force which will be:

F = kx

mg = kx

x = mg/k

x = 906.5/21900

x = 0.04139m.

The spring stretched for 0.04139m.

4 0
3 years ago
the nuciel of all atoms are made of which subatomic particles A. electrons and protons B. protons and neutrons c. protons neutro
marshall27 [118]
B Protons and neutrons.  Electrons are outside the nucleus.
8 0
3 years ago
The 200-mm test tube also contained some water (besides the metal) that was subsequently added to the calorimeter (in Part A.4.)
lbvjy [14]

Answer:

The temperature  change in the calorimeter will be lower

Explanation:

Water is an example of a molecular substance. They have relatively low melting points and boiling points usually below 300° C . Water reacts with metals to a degree varying with their position in the electrochemical series.

The specific heat of water is 4179.6 Joules which is relatively high . This typically implies that water absorbs a larger amount of heat but the increase in temperature of its boiling points is relatively low. Thus; in the 200-mm test tube that contains water and was subsequently added to the calorimeter , the heat present was initially absorbed by the water and that does not result to an increase in the temperature change in the calorimeter. Thus the temperature change in the calorimeter will be lower.

5 0
4 years ago
When a technician touches a _____ it is the most dangerous, and likely to cause serious injury. a. live conductor with his right
inessss [21]

Answer: live conductor with his right hand and touches a ground with his left hand

Explanation:

When a technician touches a live conductor with his right hand and touches a ground with his left hand, it is the most dangerous, and likely to cause serious injury.

This is because when the person touches the live conductor, there will be an electrical path which will allow current flow with the aid of the person's body. This is because the body of human being is a conductor. Therefore, when the technician touches the live conductor with his right hand and touches a ground with his left hand, an electrical path is created.

4 0
3 years ago
Other questions:
  • Warm air aloft is normally higher pressure relative to colder air aloft, which is normally of lower pressure (at equivalent alti
    10·1 answer
  • You ride your bike for 1.5 h at an average velocity of 8 km/h, then for 30 min at 19 km/h. what is your average velocity?
    5·1 answer
  • How is the effect of force exerted on a body measured
    15·1 answer
  • If you are rowing a boat, you should be most concerned if you see a wave with which characteristic? help asap pls
    6·1 answer
  • 6. A man is riding a bike with an acceleration of 5.0 meters per second and a mass of the bike and him combined is 20 kg. What f
    15·1 answer
  • A U-tube is open on both ends and partially filled with water. Benzene (does not mix with water, density = 897 kg/m3) is poured
    15·1 answer
  • A cylindrical rod of length L is connected across a fixed potential difference, creating a current I through the rod. What would
    10·1 answer
  • Sketch of the distance vs time graph for a car with constant velocity
    6·1 answer
  • An evacuated tube uses an accelerating voltage of 50 kV to accelerate electrons to hit a copper plate and produce X-rays. Non-re
    13·1 answer
  • What is the definition magnetism
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!