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(a) In air at 0°C, a 1.60-kg copper block at 0°C is set sliding at 2.50 m/s over a sheet of ice at 0°C. Friction brings the block to rest. Find the mass of the ice that melts. (b) As the block slows down, identify its energy input Q, its change in internal energy ΔEint, and the change in mechanical energy for the block-ice system. (c) For the ice as a system, identify its energy input Q and its change in internal energy ΔEint. 

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

Can someone give me step by step instructions on how to solvethiskind of problem? Thank you:


4) A 10 kg block is on top of a 15 kg block and the 15 kgblockis on a frictionless ice surface. The bottom block ismovingleft. The coefficient of sliding friction between thetwoblocks is 0.5. The top block is skidding (sliding)rightwardrelative to the bottom block. The bottom block ismovingleft.

a) Draw a free-body force diagramforeach block labeling the vectors with symbols that identify thetypeof force.

b) Label any 3rd lawpairof forces.

c) What is the acceleration ofthebottom block when the top block is skidding across the bottomblock?



1) A 30.0 kg block is on ainclinethat slopes upward and to the right at 30 degrees.

a) Draw this system at the right.

b) What is the acceleration oftheblock if it is released from rest ?

c) What is the acceleration oftheblock if its initial velocity is rightward ?

d) What is the size of the normalforce?

e) Basedon your results for c) the acceleration, do the blocks speedup orslow down. EXPLAIN

Consider the following system ashaving frictionless surfaces. A 20 kg block is connected by astring to a 30 kg block over a frictionless pulley. The 30 kg blockis also connected to a spring, which is currently at equilibrium 20cm above a table top. The 20 kg block, originally at a height of 45cm above the table top, is pulled down the incline a distance of 20cm - stretching the spring and raising the 30 kg mass to a heightof 40 cm (20 cm above its original position). The 20 kg block isthen released from rest.

If k=250 N/m, find the velocity of the 30 kg mass as it reachesits original height on its way back down.

[hint: Use conservation of energy, setting U = 0 at theequilibrium point of the spring. Also note that the 45 cm height ofthe 20 kg block is not its initial height.]

Part A.

Blocks A, B, and C are pushed across a frictionless table by a hand that exerts a constant horizontal force. Block A has mass 2M block B has mass 3M and block C has mass M.

a) Draw separate free-body diagrams for each of the three blocks. Clearly label the forces. in the spaces below, draw vectors to represent the net force on each block.
b) Draw the vectors with correct relative magnitudes.

Part B.

Blocks A and B are at rest on a level, frictionless surface. Block B is attached to an ideal massless spring of constant k, which is initially at its equilibrium length. Block B has greater mass than block A (mB > mA).

During the interval from t1 to t2 a hand pushes block A to the left with a constant force of magnitude F0, compressing the spring a distance as shown. At time t2, both blocks again have a speed of zero.

Consider system A consisting of block A and system BS consisting of block B and the spring.

c) During the interval from t1 to t2, is the absolute value of the net work done on system BS by external forces, greater than, less than, or equal to that done on system A by external forces?

 

 

At some later time, the hand is holding the blocks at rest with the spring compressed a distance d0. At time t3 the hand releases the blocks. At time t4, the spring returns to its equilibrium length and both blocks have speed vf, as shown.

Consider the interval from t3 to t4:

d) Is the change in kinetic energy of system BS greater than, less than, or equal to that of system A?
e) Is the change in total energy of system BS positive, negative, or zero?

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