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Anastaziya [24]
2 years ago
14

An 87.6 g lead ball is dropped from rest from a height of 7.00 m. The collision between the ball and the ground is totally inela

stic. Assuming all the ball's kinetic energy goes into heating the ball, find its change in temperature.
Physics
1 answer:
bija089 [108]2 years ago
7 0

Taking specific heat of lead as 0.128 J/gK = c

We have energy of ball at 7.00 meter height = mgh = 87.6*10^{-3}*9.81*7

When leads gets heated by a temperature ΔT energy needed = mcΔT

                                                                      = 87.6*10^{-3}*0.128*10^3ΔT

Comparing both the equations

                      87.6*10^{-3}*9.81*7 = 87.6*10^{-3}*0.128*10^3ΔT

                        ΔT = 0.536 K

                        Change in temperature same in degree and kelvin scale

                                      So ΔT = 0.536 ^0C

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luda_lava [24]
Hope this helps you.

4 0
3 years ago
You lay a mirror flat on the floor with one edge against a wall and aim a laser at the mirror. The ray reflects from the mirror
joja [24]

Answer:

the angle of incidence θ is 45.56 º

Explanation:

Given data

strikes the mirror before wall x = 30.7 cm

reflected ray strikes the wall y =  30.1 cm

to find out

the angle of incidence θ

solution

let us consider ray is strike at angle  θ so after strike on surface ray strike to wall at angle 90 - θ

we will apply here right angle triangle rule that is

tan( 90 - θ) = y /x

tan( 90 - θ)  = 30.1 / 30.7

90 - θ = tan^-1 (30.1/30.7)

90 - θ = 44.4345

θ = 45.56 º

the angle of incidence θ is 45.56 º

4 0
3 years ago
Which of the following has the greatest mass?<br> A. star<br> B. moon<br> C. planet<br> D.galaxy
Rashid [163]

Answer: I think the answer is d

Explanation: sry if wrong

3 0
3 years ago
A helicopter carrying Dr. Evil takes off with a constant upward acceleration of 7.0 m/s2. Secret agent Austin Powers jumps on ju
krok68 [10]

Answer:

a) 725.5 m

b) 630 m

Explanation:

Given data:

acceleration of Helicopter = 7.0 m/s^2

time spent upwards by helicopter = 11.0 seconds

a) Determine the maximum height above ground reached by the helicopter

h1  = at^2 /2

   = 7 * 11^2 / 2

   = ( 7 * 121 ) / 2 =  423.5 m  

  also v = a*t  = 7 * 11 = 77 m/s

also we calculate h2

h2 = v^2 / 2g

    = (77^2) / 2 * 9.81

    = 302 m

therefore the maximum height =  302 + 423.5 = 725.5 m

b) Given that ;  power deploys a jet pack strapped on his back at 7.0 s and with a downward acceleration of ; 1.0 m/s^2

<u>Determine distance Power reaches before helicopter crashes </u>

s = ut + 1/2 at^2

h.gt^2 - 77t - 423.5 m = 0

h.gt^2 - 77t = 423.5

t = 17. 66 secs

Yf = 423.5 + 77 *7 - 4.9 *7

Yf = 928.2

Vf = u + at

    = 77 - 9.8*7  = 8.4 m/secs

t' = 17.66 - 7 = 10.66 secs

hence

Yf = 725.5 - 8.4 * 10.66 + 1/2 * -1 * 10.66

   = 630 meters

6 0
2 years ago
Find the kinetic energy of a bullet weighing 0.10 N if its velocity is<br> 2.0 X 103 m/s?
irina1246 [14]

The kinetic energy of the bullet is 20.4 kJ.

<u>Explanation:</u>

Kinetic energy of a bullet will be equal to the product of mass of the bullet with the square of velocity or speed of the bullet and then the half of that product value.

But here the mass of the bullet is not given, instead the weight of the bullet is given in terms of force. So from this, we have to first find the mass of the bullet.

We know that as per Newton's second law of motion, force is directly proportional to the product of mass and acceleration. So here the acceleration will be equal to the acceleration due to gravity as it is weight of the object.

So F = mg

0.10 N = m × 9.8

So ,the mass of the bullet is 0.0102 kg.

Now, we know the mass and velocity of the bullet is given as 2000 m/s.

So,

kinetic energy = \frac{1}{2} × m × v²

kinetic energy = 0.5 × 0.0102 × 2000 × 2000 = 20.4 kJ

Thus, the kinetic energy of the bullet is 20.4 kJ.

5 0
3 years ago
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