24. horizontal force of 200N is applied to move a 55kg cart initially at rest) a

Question

24. horizontal force of 200N is applied to move a 55kg cart initially at rest) across a What is the final speed of the cart? a. 6.0 m/s b. 8.5 m/s c, 36 m/s d, 73 m/s 25. the your car panic, skid a in distance on a straight level road If you have been travelling twice as fast, what distance would you have skidded under the same conditions? a) would have skidded further b) It would have skidded twice as far c) It would have skidded 1.4 times further given d) It is impossible to tell from the information 26. What work is required to stretch a spring of spring constant 40 Nhm from 0.20 m to 0.25 m?( Assume x that the unstretched position is at x 0) a) 0.05 J b) 0.45J c) 0.80 J d) 1.30 J 27. Which of the following statements is NOT correct? independent on the path taken. of path B A. a) The work done by a conservative force on an object is B is negative that b) The work done by a conservative force on along path c) The force due to gravity is an example of a conservative force. d) Friction is an example of a conservative force. taken. e) The work done by friction on an object depends on the path 28. A 12 kg object is moving on a rough, level surface. It has 24 kinetic energy. The friction force on it is a J of constant 0.5N. How far will it slide? a) 2.0 mi b) 12 m c) 24 m d) 48 m

Explanation / Answer

24.
c)
36 m/s
25)
by applying brakes after some time car will come to rest
from
V^2-u^2 = 2as
u^2= 2as
s = u^2/2a
if speed increase doubles
then stopping distance increses by 4 times
Answer: A) it would have skidded 4 times further
26)
W = 0.5*40*(0.25^2-0.20^2) = 0.45
b)
0.45 J
27)
d) friction is also example of conservative force(wrong statement)
28)

0.5*s = 24 J
s = 48 J
d) 48J

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