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Q1. A professor's office door is 0.80 wide, 3.0 high, and 5.0 thick; has the mass of 25; and pivots on frictionless hinges. A "door closer" is attached to the door and the top of door frame. When the door is open and at rest, door closer exerts a torque of 5.0. What is the least force that you require to apply to the door to hold it open?
Q2. A (n) 85.2 kg person throws a (n) 0.075 kg snowball forward with a ground speed of 37.7 m/s. A second person, of mass 57.9 kg, catches the snowball. Both people are on skates. The first person is initially moving forward with a speed of 1.26 m/s, and the second person is initially at rest. What is the velocity of the first person instantly after the snowball is thrown? Disregard friction between skates and ice.
A thin lens has a focal length of 10 cm. An object is located 15 cm to the left of the lens. What is the total magnification of the lens system
An RL circuit consists of a switch, an emf source Eo, a 4 kΩ resistor, and a 5 H inductor. If the potential across resistor is 16 V 5 ms after switch is closed, find out the source emf, Eo.
A small mailbag is released from a helicopter that is descending steadily at 1.00 m/s. After 3.00 s, What is the speed of the mailbag
An artificial satellite circles the Earth in a circular orbit at a location where the acceleration due to gravity is 5.24 m/s^2.
The tension in the string when the ball is at the very bottom of the circle is 4.3 N. At the very bottom of the circle, a very sharp knife is suddenly inserted, to cut the string directly below point of support. How far to the right of where the s..
A 1000-N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. A 1960-N crate hangs from the far end of the beam.
A passenger car traveling down a rough road bounces up and down at 1.3 Hz with a maximum vertical acceleration of 0.20 m/s^2, What is the maximum speed of the oscillation
A cannon fires a cannonball from the top of a wall at a speed of 25.58 m/s and an angle of 17.44 degrees from the horizontal. What is the horizontal distance from the wall where the fired cannonball hits the ground
Consider a diffraction grating with 7000. lines/cm with a screen 2.50 m away and 440. nm wavelength light. How many side maxima would be observed on one side of the central maximum
Whole blood has a surface tension of 0.068 N/M & a density of 1050kgm-3.what weight can whole blood rise in a capillary blood vessel that has radius 2.0 x 10-6 if the contact is zero.
A person doing a chin-up weighs 655 N exclusive of the arms. During first 15 cm of the lift, each arm exerts an upward force of 355N on the torso. If the upward movement starts from rest, what is the person's velocity at this point.
A metal rod is 40.127cm long at 20.3 oC and 40.149cm long at 45.0 oC. Calculate the average coefficient of linear expansion of the rod's
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