1. To push a S0-kg crate across a frictionless floor, a worker applies a force o
ID: 1780015 • Letter: 1
Question
1. To push a S0-kg crate across a frictionless floor, a worker applies a force of 210 N, directed 20 above the horizontal. As the crate moves 3.0 m, what work is done on the crate by (a) the worker, (b) the weight of the crate, (c) the normal force exerted by the floor on the crate? (d) What is the total work done on the crate? 2. A 45-kg block of ice slides down a frictionless incline 1.5 m long and 0.91 m high. A worker pushes up on the block parallel to the inclime so that it slides at a constant speed (a) Find the force exerted on the block by the worker (b) Find the work done on the block by the (O) worker. (i) the weight of the block, (ii) by the normal force exerted on the block by the surface and (av) by the net (resultant) force 3. A 100 kg satellite orbits the earth at 300 km altitude Calculate the kinetic energy of the satellite. (mean radius of earth is 6.37 10 m) 4 Kinetic energy of an electron in copper is 6.7 10-19J Calculate its velocity (magnitude) 5 A S ON force is appled to stretch a 1prng by 12 cm tom it, related positon m 4 Calculate the spring constant Calculate the work done by the spring What is work done by the force? Calculate the average power needed by the force to stretch the string Fo F10 F3Explanation / Answer
here,
mass , m = 50 kg
force applied , F = 210 N
theta = 20 degree
s = 3 m
a)
the work done on the crate by the worker , Ww = F * s * cos(theta)
Ww = 210 * 3 * cos(20) J
Ww = 592 J
b)
the work done by the weight of crate , W2 = W * s * cos(90) = 0 J
c)
the work done by the Normal force on crate , W3 = N * s * cos(90) = 0 J
d)
the total work done on the crate , T = Ww + W1 + W2
T = 592 J
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