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4 big dictionaries, each 10.0 cm thick and each 1.50 kg, are resting side by side flat on a table 1.06 m high.
How much work would it take to stack them one atop the other?
How high would that raise the center-of-mass of all books?
A massless rigid rod of length L = 30.2 cm has a ball of mass m = 0.134 kg attached to one end. The other end is pivoted so that the ball moves in a vertical circle. The ball is launched from the horizontal position A with an initial downward speed v0. It just reaches point D and stops. Calculate v0.
A 1750 N
N irregular beam is hanging horizontally by its ends from the ceiling by two vertical wires (A
A and B
B), each 1.20 m
mlong and weighing 0.260 N
N. The center of gravity of this beam is one-third of the way along the beam from the end where wire A
A is attached. Ignore the effect of the weight of the wires on the tension in the wires.
A 100-N piano is moved 20 m across a floor by a horizontal force of 35 N. Find the coefficient of friction. What happens to the energy ?
Explain different cases of stationay waves applications
While playing at Azadi Stadium, Ali threw a soccer ball that reached a maximum height of 30 meters. If he did not defend, he would have landed at a distance of 70 meters. Yes, Ali throws the ball when the ball is 2 meters above the ground and there is no air resistance, at what horizontal distance does the defense catch the ball?
A spaceship whose mass is 150,000 kg is traveling with constant velocity, free from any gravitational influences, in deep space. What is its weight? Explain your answer.
(a) When you step on a weighing scale set on a level ground, is the scale’s reading a true measure of your weight? (b) Would the scale reading differ when the scale is set on a sloping surface? Clearly explain your answers using Newton’s 3rd law of motion.
Two forces act on a 2-kg box. The first force is 10 N to the right, while the second force if 5 N to left. Determine the resultant acceleration. [Hint: Solve for the value of the net force applied to the box. Then, solve for the box’s acceleration. Remember to specify the direction of the acceleration when giving your final answer.]
A force was applied to car whose mass is 2,100 kg. The car then accelerates at 0.7 m/s2. If the same force is applied to another car whose mass is 100 kg lesser, what is the resulting acceleration? [Hint: Solve for the value of the force applied to the 1st car. Then, compute the mass of the 2nd car, and solve for its acceleration.]
