Physics second exam 2

The adjacent figure shows a setup of three masses that are connected by three wires. The whole system is under static equilibrium. If m1 = 10 kg, m2 = 20 kg and m3 = 30 kg, The tension (T1) in the first wire (measured in Newtons) is:

The figure to the right shows a mass 15-kg at rest and hanging from a vertical rope which is also hanging from two ropes. The tension T (in N) in the vertical rope is:

Three equal mass blocks each of mass m = 2 kg can move together over a horizontal frictionless surface. Two forces F1 = 40 N and F2 = 10 N are applied on the three masses system as shown in the figure the magnitude of the net force on the middle mass (in N) is:

A person stands on a scale in an elevator, The maximum and minimum scale reading are 591 N and 391 N respectively. If the acceleration of the elevator is constant , then the weight (N) of the person is:

In the figure mass m = 2 kg and the coefficients of static and kinetic friction are μs = 0.4, μk = 0.2 respectively. The acceleration (in m/s^2) of mass m is:

In the figure shown M = l0 kg and m = 4 kg. The coefficient of kinetic friction between the inclined surface and mass m is µk = 0.3. Given that the system started from rest, find the speed (in m/s) of mass M when it has fallen a distance of 2 m.

If the coefficient of kinetic friction (µk ) =0.2 , then the acceleration (in m/s^2 ) of the block is:

A small ball of mass is suspended from a string of length L The ball revolves with constant speed v in the horizontal circle of radius r as shown in the adjacent. if the string makes an angle θ with the vertical direction, the speed v of the ball is given by:

A 750 Kg travels at 90 km/h around a curve with radius of 160 m. the banking an angle of the curve so that the car makes the turn successfully is:

A 2-kg object is held stationary on a wall by a horizontal force F as shown. The static coefficient of friction between the object and the wall is 0.5. What is the minimum force required to hold the object from sliding down?

Power P is required to lift a body a distanced at a constant speed v. The power required to lift the body a distance 2d at constant speed 6v is: (ignore air resistance)

Two balls A and B of masses 2m and m, respectively are raised to the same height h and then back to the initial point, the total work done by the gravitational Force on B is:

A spring under a compression x has a potential energy U when the compression is doubled 2x the potential energy stored in the spring is ?

A small object of mass m starts at rest at the position shown and sides along the frictionless (loop –the-loop) track of radius R what is the smallest value of ( y ) such that the object will slide without contact with the track?

A skier starts with an initial speed vi = 10 m/s at the bottom of a rough steady upward 30° inclined plane as shown. The skier travels a distance of 6 m along the plane before coming to rest. The value of the coefficient of kinetic friction is:

If the block shown slides from rest from point A and comes to complete stop against the spring at point B after moving 3 meters, then amount the spring has been compressed (in m) is:

Ball of mass 150 g is fired straight up with an initial velocity vi=10 m/s. It raised up, reached its maximum height and then came to the same initial position . the work in joules done on the ball by gravitational force through the entire trip is :

A particle of mass m=5 kg is released from rest at Point A and slides on the frictionless truck shown in the adjacent figure if hA = 15 m and hB = 4 m The practical’s speed in m/s at point B is :