1. You are holding a steel ball in your hand that you throw up into the air. Using position, velocity, acceleration, and force, describe the motion of the ball from the time it is touching your hand until it hits the ground.
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- B5A block of mass m is dropped from the fourth floor of an office building and subsequently hits the ground with speed v. From which floor is the mass dropped to double the impact speed? a. The tenth floor. b. The sixth floor. c. The sixteenth floor. d. The twelfth floor. e. The eighth floor. If an object of mass m moves with constant speed v, the net force on the object is: a. mv b. ma c. mg d. None of these answers is correct e. 025. Two objects of unequal mass are dropped from the same height near the surface of the earth. Which of the following is the same for both objects just before they hit the surface? (Ignore friction.) A. velocity B. net force C. momentum D. kinetic energy
- A boxer punches a punching bag. The time of impact of the glove and the bag is 0.01 s and the mass of the glove and hand is 2.7 kg. The velocity of the glove just before impact is 9.1 m/s. What is the average impact force exerted on the glove? A.) -2710 N B.) -2457 N C.) -2045 NA stationary soccer ball of mass m = 0.88 kg is booted with a constant force of F = 21 N. The woman's foot is in contact with the ball for t = 0.44 s. 1) Write an expression for the speed of the ball, vi, as it leaves the woman's foot. 2) What is the velocity of the ball right after contact with the foot of the woman? 3) If the ball left the woman's foot at an angle θ = 45° relative to the horizontal, how high h did it go in meters?8. A friend throws a basketball to you as you are standing on a frictionless patch of ice. To make sure you gain as much speed as possible you decide to: * Catch the basketball and drop it Catch the basketball and hold onto it. Catch the basketball and throw it back towards your friend. Catch the basketball and throw it the same direction it was moving before you caught it. O Duck and don't allow the basketball to contact you at all.
- A homogeneous pulley with two grooves consists of two wheels which turn together as one around the same axis. The moment of inertia of the two wheels together is ICM = 40 kg m2. The radii are: R1 = 1.2 m and R2 = 0.4 m. The masses that hang on both sides of the pulley are m1 = 36 kg and m2 = 12 kg. We will assume that the masses of the ropes are negligible. Determine the angular acceleration of the pulley, acceleration of the masses, and the tensions of the ropes.1. A large semi truck has a mass of 35,000 kg. It collides head on with a car that has a mass of 1000 kg. The car’s initial velocity is 10 m/s and the truck’s initial velocity is 5 m/s in the opposite direction. What can you say about the forces and velocities of the two vehicles? a) The force that the truck makes on the car is much larger than the force the car makes on the truck so the car’s velocity changes much more than the truck’s does. b) The force that the truck makes on the car is equal to the force the car makes on the truck so the car’s velocity changes by the same amount that the truck’s velocity does. c) The force that the truck makes on the car is equal to the force the car makes on the truck but the mass of the truck is much larger than the car so the car’s velocity changes by much more than the trucks does. d) The mass of the truck is so much larger than the car that the force of the truck on the car is much greater than the force the car puts on the truck and the car…The bouncing of a falling object from the ground can give us clues about the ground forces on the object during the bounce. A steel ball is dropped from a height h1= 1.6 m as shown in the figure below. It bounces off the ground with a velocity v2. You can split this problem into two different motions. 1) Dropping the ball from h1; and 2) ball in contact with the ground; Solve each as a separate problem by identifying the initial and final velocity for each part. Make sure you have the correct signs for the velocity. (a) Calculate the velocity v1 as the ball hits the ground. On the diagram indicate the positive and negative directions. Identify the initial velocity and final velocity for this part. Show the useful description, the physics concepts, principles, or equations, all mathematical steps, and any cross-checks or making sense of the answer. (b) Assume that the ball is in contact with the ground for t=0.1 s. If v2= 4.5 m/s, calculate average acceleration of the ball during…
- What is the acceleration of a 4700 kg rocket taking off from the moon, where the acceleration of gravity is only 1.6 m/s2, if the rocket expels 8.00 kg of gas per second at an exhaust velocity of 2.20 x 103 m/s? m/s2 Additional Materials O Reading1. Which of the following statements is/are TRUE? a. The coefficient of restitution can take up a value greater than 1. b. The center of mass can be located outside the object, especially those with curved structures. c. The initial momentum of a moving body is directly proportional to the force applied and to the duration of its application. d. The final velocities of two colliding objects can be calculated if the coefficient of restitution is given along with the objects' initial velocities.A 5.75 x 10°-kg rocket takes off from the moon where the acceleration due to gravity is 1.60 m/s2 by exhausting 5.00 kg of gas per second at a speed of 2.20 x 10° m/s. Determine the acceleration of the rocket. m/s2 Additional Materials