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3 years ago

If both of these balls are traveling down a bowling lane at the SAME speed, which one would would have more kinetic energy?

Physics

1 answer:

Mariana [72]3 years ago

3 0

<h2>Answer:</h2>

<u>Ball A has more kinetic energy</u>

<h2>Explanation:</h2>

As we know that Kinetic energy is given by

K. E = 1/2 mv²

Since K E is dependent upon both mass and velocity so increasing mass will produce more kinetic energy if the speed remains constant

As the mass of ball A is greater than ball B so we can say that the kinetic energy of ball is more than ball B

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4. A 75 kg bobsled is pushed along a horizontal surface by two athletes. After the

vlada-n [284]

The net force on the sled is 300 N

Explanation:

First of all, we start by finding the acceleration of the bobsled, by using the suvat equation:

$v^2-u^2=2as$

where:

v = 6.0 m/s is the final velocity of the sled

u = 0 is the initial velocity

a is the acceleration

s = 4.5 m is the displacement of the sled

Solving for a, we find

$a=\frac{v^2-u^2}{2s}=\frac{6.0^2-0}{2(4.5)}=4 m/s^2$

Now we can find the net force on the sled by using Newton's second law:

F = ma

where

F is the net force

m = 75 kg is the mass of the sled

$a=4 m/s^2$ is the acceleration

Solving the equation, we find the net force:

$F=(75)(4)=300 N$

Learn more about acceleration and Newton laws here:

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8 0

3 years ago

A 0.091-in-diameter electrical wire at 90°F is covered by 0.02-in-thick plastic insulation (k = 0.075 Btu/h·ft·°F). The wire is

olya-2409 [2.1K]

Answer:

The critical radius of the plastic insulation is 0.72 inches.

Explanation:

Given that,

Diameter = 0.091 in

Thickness = 0.02 in

Initial temperature = 90°F

Final temperature = 50°F

Heat transfer coefficient = 2.5 Btu/h.ft²°F

Material conductivity = 0.075 Btu/h.ft °F

We need to calculate the critical radius of the plastic insulation

Using formula of critical radius

$r_{cr}=\dfrac{2K}{h}$

Where, k = Material conductivity

h = Heat transfer coefficient

Put the value into the formula

$r_{cr}=\dfrac{2\times0.075}{2.5}$

$r_{cr}=0.06\ ft$

$r_{cr}=0.72\ inches$

Hence, The critical radius of the plastic insulation is 0.72 inches.

4 0

2 years ago

You use 35 J of energy to move a 7.0 N object. How far did you move it?

Lesechka [4]

The object has been moved by 5 m

Explanation:

The work done by a force when moving an object (which is equal to the energy used to move the object) is given by

$W=Fd cos \theta$

where

F is the magnitude of the force

d is the displacement of the object

$\theta$ is the angle between the direction of the force and of the displacement

In this problem, we have

W = 35 J is the work done

F = 7.0 N is the magnitude of the force

$\theta=0^{\circ}$ , assuming the force is applied parallel to the direction of motion of the object

Therefore, we can solve the formula for d to find the displacement of the object:

$d=\frac{W}{F cos \theta}=\frac{35}{(7)(cos 0)}=5 m$

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6 0

3 years ago

25pts The diagram shows the positions of the sun, moon and Earth during spring tides, when the high tides are at their highest a

borishaifa [10]

The moon and sun are primarily responsible for the rising and falling of ocean tides, but, for any particular spot on Earth’s surface, the height of the tides and their fluctuation in time also depends on the shape of your specific beach, the angle of the seabed leading up to your beach, plus your larger coastline and the prevailing ocean currents and winds.

3 0

3 years ago

PART ONE

Lubov Fominskaja [6]

Answer:

change in momentum is (delta,p))= 2*m*v*sin(23) ,parallel velocity to the window remains unchanged ignore, perpendicular velocity changes by twice the initial perpendicular velocity as the hail stone changes direction with respect to the perpendicular . force=total(delta,p)/t

hence force=450*2*m*v*sin(23) /46, pressure =force/area=450*2*m*v*sin(23) /46*1.187

This is not fluid mechanics,

Just think about splitting the velocity in to vector components use elastic collision fact is energy is same after collision hence so is the speed ,use known equations.

Explanation:

4 0

2 years ago