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- Two blocks, each of mass m = 2.1kg are pushed along the horizontal surface of a table by a horizontal force P of magnitude 7.1 N directed to the right, as shown in the figure below. The blocks move together to the right at constant velocity? Find the frictional force exertered on the lower block by the table ? Find the coefficient of kinetic friction between the surface of the block and the table? Find the frictional force acting on the upper block?In the diagram shown, mass 1 (m1) is 18.79 kg and the coefficients of static and kinetic friction are 0.31 and 0.18, respectively. What is the maximum mass that mass 2 (m2) can have for the system to remain at rest? Assume that the pulley shown is ideal, massless, and frictionless. m2 = kgA baseball pitcher throws a ball straight up into the air at a speed of 21.5 m/s. In the process, he moves his hand through a distance of 2.00 m. If the ball has a mass of 0.250 kg, find the force he exerts on the ball to give it this upward speed. (Report answer to 3SF; unit: N)
- A constant retarding force of 50 N is applied to a body of mass 20 kg moving initially with a speed of 15 ms–1. How long does the body take to stop?If the rocket sled starts with only onw rocket burning, what is the magnitute of its acceleration. Assume that the mass of the system is 2.50x10^3 kg, the thrust F=2.10x10^4N and the force of friction opposing the motion is known to be f=665N. a. What is the magnitude of its acceleration?For the system below, the coefficient of kinetic friction is 0.240, m1 = 412 kg, and m2 = 470 kg. Find the acceleration of the system.
- What average force is required to stop a 1400 kg car in 8.0 s if the car is traveling at 85 km/h? Express your answer to two significant figures and include the appropriate units. Enter positive value if the direction of the force is in the direction of the initial velocity and negative value if the direction of the force is in the direction opposite of the initial velocity.If the rocket sled shown in the previous problem starts with only one rocket burning, what is the magnitude of this acceleration? Assume that the mass of the system is 2.10103kg , the thrust Tis 2.40104N , and the force of friction opposing the motion is 650.0 N. (b) Why is the acceleration n one-fourth of what it is with all rockets burning?The drawing shows Robin Hood(mass = 77.0 kg) about to escape froma dangerous situation. With one hand,he is gripping the rope that holds up achandelier (mass = 195 kg). When hecuts the rope where it is tied to thefloor, the chandelier will fall, and hewill b. pulled up toward a balconyabove. Ignore the friction between therope and the beams over which itslides, and find (a) the accelerationwith which Robin is pulled upward and (b) thetension in the rope while Robin escapes.
- One of the first ion engines on a commercial satellite used Xenon as a propellant and could eject the ionized gas at a rate of 2.98 ✕ 10−6 kg/s with an exhaust speed of 3.04 ✕ 104 m/s. What instantaneous thrust (in N) could the engine provide? (Enter your answer to at least three significant figures. Enter the magnitude.)As a protest against the umpire's calls, a baseball pitcher throws a ball straight up into the air at a speed of 17.0 m/s. In the process, he moves his hand through a distance of 1.45 m. If the ball has a mass of 0.150 kg, find the force he exerts on the ball to give it this upward speed.NTwo blocks of masses m1 = 2kg & m2 = 5kg are placed incontact with each other on a frictionless surface with angle θ =60oas in active Fig. Find the magnitude of the acceleration andtension of the system.