A person slaps her leg with her hand, which results in her hand coming to rest in a time interval of 2.35 ms from an initial speed of 4.75 m/s. What is the magnitude of the average contact force exerted on the leg, assuming the total mass of the hand and the forearm to be 1.45 kg?
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- A baseball catcher is catching a fastball that is thrown at 43 m/s (96 mi/h) by the pitcher. If the mass of the ball is 0.15 kg and if the catcher moves his mitt backward toward his body by 8.0 cm as the ball lands in the glove, what is the magnitude of the average force acting on the catcher's mitt? Estimate the time interval required for the catcher to move his hands.A ball (m = 0.350 kg) is thrown at a speed of 12.0 m/s and is hit by a bat changing the velocity to 10.0 m/s in the opposite direction. The average contact time between the ball and the bat was 2.00 ms. Determine the magnitude of the force applied by the bat to the ball. 3850 N 2500 N 3890 N 3500 NA 2210 kg car traveling at 10.1 m/s collides with a 2680 kg car that is initally at rest at a stoplight. The cars stick together and move 2.10 m before friction causes them to stop. Determine the coefficient of kinetic friction between the cars and the road, assuming that the negative acceleration is constant and all wheels on both cars lock at the time of impact.
- Jenny and Betty are having a great time at Busch Gardens riding the Ubanga Banga bumper cars. Jenny, who is traveling southward in her bumper car, aims her car toward Betty, who is traveling northward in her bumper car. The cars collide and briefly come to a stop. What is the direction of the force exerted on Jenny's car during the collision?A baseball with a mass of 150 g is thrown horizontally with a speed of 40.1 m/s (90 mi/h) at a bat. The ball is in contact with the bat for 1.00 ms and then travels straight back at a speed of 45.2 m/s (101 mi/h). Determine the average force (in N) exerted on the ball by the bat. Neglect the weight of the ball (it is much smaller than the force of the bat) and choose the direction of the incoming ball to be positive. (Indicate the direction with the sign of your answer.)A 0.160-kg hockey puck is moving on an icy, frictionless, horizontal surface. At t = 0, the puck is moving to the right at 3.00 m/s. (a) Calculate the velocity of the puck (magnitude and direction) after a force of 25.0 N directed to the right has been applied for 0.050 s. (b) If, instead, a force of 12.0 N directed to the left is applied, how long would it take to stop the puck?
- The figure shows an approximate plot of force magnitude F versus time t during the collision of a 58 g Superball with a wall. The initial velocity of the ball is 34 m/s perpendicular to the wall, in the negative direction of an x axis. It rebounds directly back with approximately the same speed, also perpendicular to the wall. What is Fmax, the maximum magnitude of the force on the ball from the wall during the collision? 4 t(ms) Number i Units (N)A baseball approaches home plate at a speed of 42.0 m/s, moving horizontally just before being hit by a bat. The batter hits a pop-up such that after hitting the bat, the baseball is moving at 50.0 m/s straight up. The ball has a mass of 145 g and is in contact with the bat for 2.30 ms. What is the average vector force the ball exerts on the bat during their interaction? (Let the +x-direction be in the initial direction of motion, and the +y-direction be up.)A block with mass m1 hangs from a rope that is extended over an ideal pulley and attached to a second block with mass m2 that sits on a ledge slanted at an angle of 20. Suppose the system of blocks is initially held motionless and, when released, begins to accelerate. (a) If m1 = 5.00 kg, m2 = 3.75 kg, and the magnitude of the acceleration of the blocks is 0.140 m/s2, find the magnitude of the kinetic frictional force between the second block and the ledge. ?N. (b) What is the value of the coefficient of kinetic friction between the block and the ledge?