Physics Force & Laws Of Motion Level: Misc Level
In a football game a kicker attempts a field goal. The ball remains in contact with the kicker s foot for 0.050 s, during which time it experiences an acceleration of 340 m/s2. The ball is launched at an angle of 51 degree above the ground. Determine the horizontal and vertical components of the launch velocity.
Physics Force & Laws Of Motion Level: Misc Level
A 56 g steel ball is released from rest and falls vertically onto a steel plate. The ball strikes the plate and is in contact with it for 0.5 ms. The ball rebounds elastically, and returns to its original height. The time interval for a round trip is 8.00 s. In this situation, the average force exerted on the ball during contact with the plate is closest to:
A) 4390 N B) 10,260 N C) 5870 N D) 7300 N E) 6210 N
Physics Force & Laws Of Motion Level: Misc Level
A block of mass m =3.7 kg, moving on as frictionless surface with a speed v,=7.7 m/s,makes a perfectly elastic collision with a block of mass M at rest. After the collision, the 3.7 kg block recoils with a speed of v, =2.1 m/s In Figure 8.1, the mass M is closest to:
A) 17 kg B) 6.5 kg C) 3.7 kg D) 9.8 kg E) 4.7 kg
Physics Force & Laws Of Motion Level: Misc Level
During a hockey a game a puck is given an initial speed of 5.50 m/s. If slides 54.00 m on the ice before it stops. What is the coefficient of kinetic friction between the puck and the ice?
a) 0.02
b) 0.03
c) 0.04
d) 0.05
Physics Force & Laws Of Motion Level: Misc Level
An object of mass m is hanging by a string from the roof of an elevator. We want to compare the tension in the string to the weight under various conditions. Which of these statements is /are true?
a) If the elevator is moving up at a constant speed the net force on the object is zero.
b) If the elevator is moving upwards and speeding up, the tension in the string is greater than the objects weight.
c) If the elevator is moving downwards in free fall, the tension in the string is equal to the objects weight.
d) If the elevator is moving downwards, and slowing down, the tension in the string is greater than the objects weight.
e) If the elevator is moving upwards, but slowing down the tension in the string is equal to the objects weight.
Physics Force & Laws Of Motion Level: Misc Level
Piston 1 has a diameter of 0.15 in: piston 2 has a diameter of 2.5 in. In the absence of friction, determine the force F, necessary to support the 1500 Ib weight.
Physics Force & Laws Of Motion Level: Misc Level
A 70 kg man in a 5.0 kg chair tills back so that all the weight is balanced on tow legs of the chair. Assume that each leg makes contact with the floor over a circular area with a radius of 1.0 cm. Find the pressure exerted on the floor by each leg.
Physics Force & Laws Of Motion Level: Misc Level
Two forces are applied to a tree stump to pull it out of the ground. Force has a magnitude of 2240 N and points 34.0 % south of east, while force F B has a magnitude at 3160 N and points due south. Using the component method, find the magnitude s direction of the resultant force that is applied to the stump. Specify the direction with respect to due east.
Physics Force & Laws Of Motion Level: Misc Level
Two ropes are attached to a heavy box to pull it along the floor. One ropes applies a force of 475 N in a direction due west: the other applies a force of 315 N in a direction due south. a) How much force should be applied by a single rope, and b) in what direction (relative to due west), if it is to accomplish the same effect as the force added together?
Physics Force & Laws Of Motion Level: Misc Level
A truck of mass 9 M is moving at a speed v = 15 km /h when it collides head on with a parked car of mass M. Spring mounted bumpers ensure that the collision is essentially elastic. Find the final velocities of each vehicle. Repeat for the case of the car moving at speed v=15 km/h and colliding with the stationary truck. What fraction of the incident vehicle's kinetic energy is transferred in each case?
Physics Force & Laws Of Motion Level: Misc Level
A superball is dropped from a height h onto a hand steel place (fixed to the earth), from which it rebounds at very nearly its original speed.
a) Is the momentum of the ball conserved during any part of this process?
b)If we consider the ball and Earth as our system, during what parts of the process is momentum conserved?
c) Answer part (b) for a piece of putty that falls and sticks to the steel place.
Physics Force & Laws Of Motion Level: Misc Level
A 2.0 kilogram block sliding on a horizontal frictionless surface is attached to one end of a horizontal spring (k=200 N /m which has its other end fixed.If the block has a speed of 4.0 m /s as it passes through the equilibrium position, what is its speed when it is 20 centimeters from the equilibrium position?
(a)3.6 m/s
(b)3.1 m/s
(c)3.5 m/s
(d)1.9 m/s
(e)2.3 m/s
Physics Force & Laws Of Motion Level: Misc Level
A projectile of mass 0.902 kg is shot straight up with an initial speed of 16.2 m /s. (a) How high would it go if there were no air resistance? (b) If the projectile rises to a maximum height of only 8.57 m, determine the magnitude of the average force due to air resistance.
Physics Force & Laws Of Motion Level: Misc Level
A 16 - kg sled is being pulled along the horizontal snow -covered ground by a horizontal force of 29 N. Starting from rest, the sled attains a speed of 2.6 m /s in 5.0 m. Find the coefficient of kinetic friction between the runners of the sled and the snow.
Physics Force & Laws Of Motion Level: Misc Level
A box of books weighing 300 N is shoved across the floor of an apartment by a force of 400 N exerted downward at an angle of 35.2 below the horizontal. If the coefficient of kinetic friction between box and floor is 0.570, how long does it take to move the box 400 m, starting from rest?
