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3 years ago

Which dog has the most kinetic energy

1 answer:

4 0

The formula to find the kinetic energy is:

Ek= 1/2 × m × v^2

1. Ek= 1/2×15×3^2
= 67.5 J

2.Ek= 1/2×8×4^2
=64 J

3.Ek= 1/2×12×5^2
= 150 J

4.Ek= 1/2×10×6^2
= 180 J

So the fourth dog has the most kinetic energy.

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Car and a train move together along straight, parallel paths with the same constant cruising speed v0. At t=0 the car driver not

musickatia [10]

Answer:

Part A: $t = v_0/a_0$

Part B: $t = v_0/a_0$

Part C: $v_0^2/a_0$

Explanation:

Part A:

We will use the following kinematics equation:

$v = v_0 + at\\0 = v_0 - a_0t\\t = \frac{v_0}{a_0}$

Part B:

We will use the same kinematics equation:

$v = v_0 + at\\v_0 = 0 + a_0t\\t = \frac{v_0}{a_0}$

Part C:

The total time takes is 2t.

So the train moves a distance of

$x = v_0(2t) = 2v_0(\frac{v_0}{a_0}) = \frac{2v_0^2}{a_0}$

And the car moves a distance in Part A and in Part B:

$d_A = v_0t + \frac{1}{2}at^2 = v_0(\frac{v_0}{a_0}) - \frac{1}{2}a_0(\frac{v_0^2}{a_0^2}) = \frac{v_0^2}{a_0} - \frac{v_0^2}{2a_0} = \frac{v_0^2}{2a_0}\\d_B = v_0t + \frac{1}{2}at^2 = 0 + \frac{1}{2}a_0(\frac{v_0^2}{a_0^2}) = \frac{v_0^2}{2a_0}$

So the total distance that the car traveled is $d = \frac{v_0^2}{a_0}$

The difference between the train and the car is

$x - d = \frac{2v_0^2}{a_0} - \frac{v_0^2}{a_0} = \frac{v_0^2}{a_0}$

8 0

3 years ago

The radiation detector that uses detection of flashes of light is a _____

Maslowich

The radiation detector that uses detection of flashes of light is a <u>scintillation counter.</u>

<h3>What is a scintillation counter?</h3>

A scintillation counter detects and measures ionizing radiation by using the excitation action of incoming radiation on a scintillating substance and detecting the light pulses that arise.

One of the most critical considerations for anyone who operate with or near radiation is being aware of the amounts of radiation present.

This is generally performed through the use of several types of radiation detectors.

The radiation detector that uses detection of flashes of light is a scintillation counter.

Hence,scintillation counter is the correct answer.

To learn more about the scintillation counter, refer:

brainly.com/question/12763694

#SPJ4

3 0

2 years ago

your stopped at a red light. You've checked the intersection to see that it is clear of vehicles and pedestrians, unless a tells

mina [271]

Answer:

Unless you are at a red light you may not proceed
You pose a threat to other drivers who are following the instructions and ethics.

3 0

3 years ago

How is velocity different than speed?

spayn [35]

I hope this helps

velocity is the rate and speed of an objects moving.

Speed is the time rate an object is moving along a path

5 0

3 years ago

A block of aluminum occupies a volume of 0.15L and weighs .405kg. what is its density

Aneli [31]

Answer:

ρ=3000 kg/m

Explanation:

My work is in the attachment.

Density is just the mass of an object/substance divided by its volume. Technically you could just divide the kg by L and be done with it, but the standard units for volume are m³. So I converted it before calculating.

8 0

3 years ago