Physics Force & Laws Of Motion Level: Misc Level
A 0.25 kg ball moving horizontally at 10 m /s is hit by a bat which reverses the ball s direction. Its final velocity is 16 m /s. The bat acts on the ball for 0.015 s.Find the average force exerted on the ball by the bat.
Physics Force & Laws Of Motion Level: Misc Level
Identical balls with initial velocities V 1=1.2 m /s and V 2 = -. 75 ( note minus sign) m /s collide head on. If the collision is perfectly elastic, what is the final velocity of each ball?
Physics Kinematics Level: Misc Level
A ball is thrown upwards with an initial speed of 80 ft /sec. a) how high does it go? B) What is its speed at the end of 3 sec? c) How high is it after 3 sec.?
Physics Force & Laws Of Motion Level: Misc Level
A 70 gram body is projected up a rough incline plane, inclined at an angle of 35 degrees to the horizontal, with an initial velocity of 400 cm /sec. The coefficient of friction between the body and the plane is 1 /2. How far up the plane will the body go?
Physics Force & Laws Of Motion Level: Misc Level
A 1200 Ib sled is pulled along a horizontal surface at uniform speed by means of a rope that makes an angle of 30 degrees above the horizontal. If the tension, T, in the rope is 100 Ibs, what is the coefficient of friction?
Physics Force & Laws Of Motion Level: Misc Level
A 5 Ib Weight suspended from a 3 ft cord is pulled to one side by a horizontal force F, so that cord makes an angle of 30 degrees with the vertical. What is the value of the force F, and what is the value of T, the tension of the cord?
Physics Rotational Mechanics Level: Misc Level
A yo - yo has a tangential acceleration of 0.98 m /s squared when it is released. The string is wound around a central shaft radius 0.35 cm. What is the angular acceleration of the yo -yo ?
Physics Rotational Mechanics Level: Misc Level
A 15.0 kg turntable with a radius of 25 cm is covered with a uniform layer of dry ice that has a mass of 9.0 kg. The angular speed of that turntable and dry ice is initially 0.75 rad /s but it increases as the dry ice evaporates. What is the angular speed of that turntable once all the has evaportaed? (use I = 0 .5 M R squared )
Physics Force & Laws Of Motion Level: Misc Level
A uniform door, of height 3.50 m and width 1.50 m and weighing 200 N, is supported by two small hinges. The hinges are symmetrically placed, 20 cm from the top and bottom of the door. If the top hinge supports the full weight of the door, find the horizontal force exerted by each hinge on the door.
Physics Force & Laws Of Motion Level: Misc Level
when two masses of unequal masses are hung vertically over a friction-less pulley of negligibly mass from a light string as shown in figure 3, the arrangement is called an Atwood machine.The device is sometimes used in the laboratory to measure the free fall acceleration. Determine the magnitude of the acceleration and the tension in the string for the masses M 1 =4.0 kg and M 2 =2.0 kg.
Physics Force & Laws Of Motion Level: Misc Level
Two blocks of masses M 1=4.0 kg and M 2= 3.0 kg are placed in contact with each other on a friction-less horizontal surface. A constant horizontal force F =9.0 N is applied to the block of mass m. A. Determine the magnitude of the acceleration of the two -block system. B. Determine the Magnitude of the contact force between the blocks.
Physics Force & Laws Of Motion Level: Misc Level
Determine the frictional force exserted by the air on body whose mass is 0.4 kg if it falls with an acceleration of 9.0 m/ s 2.
Physics Force & Laws Of Motion Level: Misc Level
A man whose mass is 90 kg is in an elevator. Determine the force the floor exerts on him when:a the elevator goes up with a uniform speed, b. the elevator goes down with a uniform speed, c.the elevator accelerate upward at 3 m /s2, and d. the elevator accelerates downward at 3 m /s 2 and, e, the cable breaks and elevator falls freely.
Physics Force & Laws Of Motion Level: Misc Level
The bodies in figure 1 have masses 10 kg, and 20 kg respectively. A force F equal to 50 N IS apllied to C. Find the acceleration of the system and the tensions in each cable.
Physics Force & Laws Of Motion Level: Misc Level
How long a time should a constant force of 80 N act on a body of 12.5 kg in order to stop it, provided that the initial velocity of the body is 72 km /hr?
