Physics Force & Laws Of Motion Level: Misc Level
Block A, with a mass of 220 g, is traveling north on a frictionless surface with a speed of 5.0 m/s.Block B, with a mass of 300 g travels west on the same surface until it collides with A, After the collision, the blocks move off together with a velocity of 3.09 m/s at an angle of 42.5% to the north of west. What was Bs speed just before the collision?
Physics Force & Laws Of Motion Level: Misc Level
Body A of mass M has an original velocity of 6.1 m/s. In the + x- direction toward a stationary body ( body B) of the same mass. After the collision, body A has velocity components of 1.2 m/s in the + x - direction and 2.2 m/s in the + y - direction. What is the magnitude of body B s velocity after the collision?
Physics Force & Laws Of Motion Level: Misc Level
A BMW of mass 1.5 x 10 3 kg is traveling at 44 m /s. It approaches a 1.1 x 10 3 kg Volkswagen going 23 m/s in the same direction and strikes it in the rear. Neither driver applies the brakes. Neglect the relatively small frictional forces on the cars due to the road and due to air resistance. If the collision slows the BMW down to 34 m/s, what is the speed of the VW after the collision?
Physics Force & Laws Of Motion Level: Misc Level
A toy car with a mass of 120 g moves to the right with a speed of 0.65 m /s. A small child drops a 32.0 g piece of clay onto the car. The clay sticks to the car and the car continues to the right. What is the change in speed of the car? Consider the frictional force between the car and the ground to be negligible.
Physics Force & Laws Of Motion Level: Misc Level
A submaringe of mass 2.1 x 10 6 kg and initially at rest fires a torpedo of mass 260 kg. The torpedo has an initial speed of 100.8 m/s. What is the initial recoil speed of the submarine? Neglect the drag force of the water.
Physics Force & Laws Of Motion Level: Misc Level
In a collision between two unequal masses, how does the impulse imparted to the smaller mass by the larger mass compare with the impulse imparted to the larger mass by the smaller one?
a. It is larger.
b. It is smaller.
c. They are equal.
d. The answer depends on how fast they are moving.
Physics Force & Laws Of Motion Level: Misc Level
A golf club exerts an average force of 1000 N on a 0.045 - kg golf ball which is initially at rest. The club is in contact with the ball for 1.8 ms. What is the speed of the golf ball as it leaves the tee?
a. 35 m/s
b. 40 m/s
c. 45 m/s
d. 50 m/s
Physics Force & Laws Of Motion Level: Misc Level
Two air track carts move along an air track towards each other. Cart A has a mass of 450 g and moves toward the right with a speed of 0.850 m/s and air track B has a mass of 300 g and moves toward the left with a speed of 1.12 m/s. What is the total momentum of the system?
a. 0.047 kg x m/s toward the right.
b. 0.719 kg x m/s toward the right.
c. 0.750 kg x m/s toward the right.
d. 0.750 kg m/s toward the left.
Physics Force & Laws Of Motion Level: Misc Level
A firecracker breaks up into two pieces, one has a mass of 200 g and flies off along the x -axis with a speed of 82.0 m/s and the second has a mass of 300 g and flies off along the y -axis with a speed of 45.0 m/s. What is the total momentum of the two pieces?
a. 361 kg x m/s at 56.3 degrees from the x- axis.
b. 93.5 kg x m/s at 28.8 degrees from the x- axis.
c. 21.2 kg x m/s at 39.5 degrees from the x -axis.
d. 361 kg x m/s at 0.983 degrees from the x- axis.
Physics Force & Laws Of Motion Level: Misc Level
A 1.0 m long beam is suspended from a wall at one end and supported by a steel wire, at a 30 degree angle to the beam,at the opposite end. A 100 kg sign is suspended 0.75 m from the supporting wall out along the beam.The beam has a mass of 10 kg that is distributed uniformly through out the beam. Find the tension in the wire and the verticaland horizontal forces the wall exerts on the beam.
Physics Force & Laws Of Motion Level: Misc Level
The figure shows one cart colliding into another cart is at rest. Using the appropriate equations solve the following problems.
a) what is Vf if the carts stick together? ( perfectly inelastic)
b) What is V1 f and V 2 f if the collision is perfectly elastic?
Physics Force & Laws Of Motion Level: Misc Level
Why is it better to crash into an air bag than into the steering wheel of a car? You must put your answer in terms of change of momentum, impulse, force, and time of action of the force.
Physics Force & Laws Of Motion Level: Misc Level
A lump of clay and a rubber ball have the same mass and are dropped from the same height. The clay sticks to the floor, the ball bounces back up. Which object experiences the greatest momentum change?Why?
Physics Force & Laws Of Motion Level: Misc Level
The figue is a sketch of two carts rest next to each other. A spring in one cart is released and sends the carts flying apart
a) is momentum conserved? Prove it.
b) What is the total kinetic energy after the" explosion"
c) The K E ( Before) was 0: they were not moving. Where did the K E ( After) come from?
Physics Force & Laws Of Motion Level: Misc Level
A bow exerts a force of 25 N on a 100. g arrow for 0.46 s. As it leaves the bow the arrow has a velocity of 115 m.
a) What impulse was given to the arrow?
b) What change in momentum did the arrow have, in kg. m /s?
c) using algebra show that the equation impulse =change in momentum is just another form of Newton s Second Law equation.
