What effect does horizontal velocity have on time of flight for a particle undergoing projectile motion over level ground with no drag? Explain.
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a) What effect does horizontal velocity have on time of flight for a particle undergoing projectile motion over level ground with no drag? Explain.
b) Two cars that are otherwise identical except that one has twice the mass of the other drive side by side and begin to brake at the same instant. Both cars come to rest having stopped with the friction force alone. Which car requires a greater distance to stop? Explain.
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- The two ramps shown are both frictionless. The heights y, and y, are the same for each ramp. A block of massm is released from rest at the left-hand end of each ramp. Which block arrives at the right-hand end with the greater speed? Block I Block II m y1 y2 2012 Pearson Education, Inc The answer depends on the shape of the curved track O the block on the straight track O the block on the curved track OBoth blocks arrive at the right-hand end with the same speed.Problem 2. Consider the system shown in Figure 1 with m,= 12.5 kg, m, = 20.0 kg. Object m, is resting on the floor, and object m, is 4.00 m above the floor when it is released from rest. The pulley axis is frictionless. The cord is light does not stretch, and does not slip on the pulley a. What is the magnitude %3D %3D the acceleration of the object. b. Calculate the time interval required for m, to hit the floorA puck in a shuffleboard game slides a total of 12 m before coming to rest. It kinetic coefficient between the puck and shuffleboard is 0.10. How does one determine the puck’s initial speed in m/s?
- You are in an elevator that is initially at rest. At t=0, it heads downward and speeds up as a function of time. It experiences a velocity given by v(t) = (−2.00t²ĵ)² m S a) What is the normal force that you experience at t=1.20 s? Assume you have a mass of 70.0 kg. b) How far did the elevator drop in 1.20 s?A sled and rider have a total mass of 60.0 kg. They are on a snowy hill. The coefficient of kinetic friction between the sled and the snow is 0.150. The angle of the hill's slope measured upward from the horizontal is 24.0°. What is the acceleration of the rider?Is the acceleration greater, less than, or equal to your result if a more massive rider uses the same sled on the same hill? Explain.3c
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- Each hand pushes with a constant force 4. Two identical blocks are connected by an ideal spring. The blocks are pushed towards each other across a level frictionless surface by hands that each exert a constant horizontal force of magnitude F,. At time t, the blocks have speed v, and the spring is at its equilibrium length. At time t2, when the experiment ends, the blocks have each moved a distance d,. The speed of each block at time t2, V2, is less than v,. of magnitude F, v, v, B dietat a. State whether each of the following quantities is positive, negative, or zero during the interval from t to t. Explain. t= 1, A i. The work done on block A by the hand ii. The work done on block B by the hand o mn iii. The net work done by external forces on system S (consisting of block A, block B, and the spring.) b. During the interval from t to t,, does the total energy of system S increase, decrease, or sta the same? Explain. c. Consider the following statement: "The kinetic energy of the…A 150-g baseball is dropped from a tree 15.0 m above the ground. a.)With what speed would it hit the ground if air resistance could be ignored? Express your answer to three significant figures and include the appropriate units. b.)If it actually hits the ground with a speed of 8.00 m/s, what is the magnitude of the average force of air resistance exerted on it? Express your answer to three significant figures and include the appropriate units.16. Running without friction is impossible. In fact, to maximize your acceleration, you need to maximize the static friction between your shoes and the floor. a) Explain why static friction is necessary for running or walking. requirement, employees' shoes must have a coefficient of static friction of 0.5 or more on a specified tile surface. In an emergency, what is the minimum time interval in which a postal worker starting from rest can move a distance of 3 m on the tile surface? c) A typical athletic shoe has a coefficient of static friction of 0.8 when used on a running track. What is the minimum time interval in which an athlete starting from rest can move a distance of 100 m on a running track? b) To meet a U.S. Postal Service