Question

A 2.03-g lead bullet traveling at 508 m/s strikes a target, converting its kinetic energy into thermal energy. Its initial temperature is 40.0°C. The specific heat is 128 J/(kg · °C), latent heat of fusion is 24.5 kJ/kg, and the melting point of lead is 327°C.

(a) Find the available kinetic energy of the bullet.

J

(b) Find the heat required to melt the bullet.

J

Answer #1

**(a)**

**(b)**

Estimate the speed that a lead bullet must have in order that it
melts completely when it strikes a target. Assume that all the
bullet’s kinetic energy goes into heat and that the bullet is
initially at 20oC. The specific heat capacity of lead is 130 J /
(kg oC), its melting point is at 327oC its latent heat of fusion is
24.5 kJ/kg.

A lead bullet of unknown mass leaves a rifle at a temperature of
87 C and hits a steel plate. Upon impact exactly half of the
bullet's mass melts. Assume that only 40% of the bullet's initial
kinetic energy goes into increasing its temperature and then
partially melting it. What was the initial speed of the bullet?
melting temperature of LEAd: 327 C specific heat of Lead: 0.13E3
J/(Kg.K) Latent heat of fusion: 22.9E3 J/kg

A 4.21 kg lead billet is to be melted for a casting operation.
Lead has a melting point of 328°C, a specific heat capacity of 128
J/(kg·°C), and a latent heat of fusion of 23,200 J/kg. (use correct
number of significant figures in your final answer.)
(a) Calculate the amount of heat required to heat the lead from
a starting temperature of 21.7°C to its melting point of 328°C.
(b) Calculate the amount of heat needed to melt the lead...

A lead bullet is shot down from the altitude of 100 m above the
ground. What must be the
minimal initial velocity of the bullet so that it completely melts
after a perfectly inelastic collision
with the ground? The initial temperature of the bullet is 500 K,
melting temperature of lead is 600
K. Speci c heat capacity of lead is c = 130 J/(kgK), speci c heat
of fusion of lead is r = 24 kJ/kg.
The heat released...

A 0.00600 kg bullet traveling horizontally with speed 1.00
103 m/s strikes a 21.4 kg door, embedding itself 11.3 cm
from the side opposite the hinges as shown in the figure below. The
1.00 m wide door is free to swing on its frictionless hinges.
A door shown from above such that its hinge is on the top side
of the figure with the door going down. A bullet is traveling
horizontally to the right towards the door on the...

A 0.00400-kg bullet traveling horizontally with speed 1.00 103
m/s strikes a 20.0-kg door, embedding itself 10.9 cm from the side
opposite the hinges as shown in the figure below. The 1.00-m wide
door is free to swing on its frictionless hinges. (a) Before it
hits the door, does the bullet have angular momentum relative the
door's axis of rotation? Yes No (b) If so, evaluate this angular
momentum. (If not, enter zero.) kg · m2/s If not, explain why...

A 0.00400-kg bullet traveling horizontally with speed 1.00 103
m/s strikes a 17.7-kg door, embedding itself 10.2 cm from the side
opposite the hinges as shown in the figure below. The 1.00-m wide
door is free to swing on its frictionless hinges. (a) Before it
hits the door, does the bullet have angular momentum relative the
door's axis of rotation? Yes No (b) If so, evaluate this angular
momentum. (If not, enter zero.) kg · m2/s If not, explain why...

What mass of steam at 100°C must be mixed with 216 g of ice at
its melting point, in a thermally insulated container, to produce
liquid water at 65.0°C? The specific heat of water is 4186 J/kg·K.
The latent heat of fusion is 333 kJ/kg, and the latent heat of
vaporization is 2256 kJ/kg.

What mass of steam at 100°C must be mixed with 162 g of ice at
its melting point, in a thermally insulated container, to produce
liquid water at 71.0°C? The specific heat of water is 4186 J/kg·K.
The latent heat of fusion is 333 kJ/kg, and the latent heat of
vaporization is 2256 kJ/kg.

A 50 gram lead bullet is fired at 450 m/s to a 3 kg block of
copper and penetrates the block. Assuming that the bullet does not
leave the block, if the initial temperature of the bullet is 60°C
and the block is originally at 30°C,
a) Find the final temperature of the bullet-block system.
(Assume that the system is isolated and there is no heat escaping
the system)
b) Is the dissipated energy (due to the collision) enough to...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 5 minutes ago

asked 5 minutes ago

asked 7 minutes ago

asked 10 minutes ago

asked 15 minutes ago

asked 17 minutes ago

asked 20 minutes ago

asked 26 minutes ago

asked 42 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago