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Question: A uniform 300-N trapdoor in a ceiling is hingedat one side.
a) Find the net upward force needed to begin toopen it, if the upward force is applied at the center.
b) Find the total force exerted on the door bythe hinges, if the upward force is applied at the center.
c) Find the net upward force needed to begin toopen it, if the upward force is applied at the center of the edgeopposite the hinges.
d) Find the total force exerted on the door bythe hinges, if the upward force is applied at the center of theedge opposite the hinges.
A car traveling 100 km/h strikes a tree. The front end of the car compresses and the driver comes to rest after traveling 1.0m. What was the magnitude of the average acceleration of the driver during the collision?
You are driving home from school steadily at 95 km/h for 180 km. It then begins to rain and you slow to 65 km/h. You arrive home after driving 4.5 hours. How far is your hometown from the school? What was your average speed?
What is the wavelength of radio waves. An electron in a TV is accelerated toward the screen across a potential difference of 54.2kV. How much kinetic energy does the electron gain while accelerating.
A 6.70mW helium neon laser emits a visible laser beam with a wavelength of 636nm . How many photons are emitted per second
question a laser emits a narrow beam of light. the radius of the beam is 1.5 mm and the power is 2.9 mw. what is the
Two steel wires are stretched under the same tension. The first wire has a diameter of 0.485 mm, what is the speed of waves traveling along the second wire
a wire of arbitrary shape which is confined to the x-y plane carries a current i from point a to point b in the plane.
You want to design a helium-filled balloon that will lift a totalpayload of 1350 kg. What volume of heliumis needed to just barely lift this payload
A 20.2 kilogram boy descends a slide 3.1 meter high and reaches the bottom with a speed of 2.1 m/s. Find how much thermal energy due to friction was generated in this process
If n=10, what is the largest value of the angular momentum l in this shell, How many electrons can be placed in this shell
The space shuttle releases a satellite into a circular orbit 700 km above the Earth, How fast must the shuttle be moving (relative to Earth's center) when the release occurs
two batting robot sliding on a frictionless surface. Robot A, with a mass 20 kg, initially moves at 2.0 m/s parallel to the x-axis. It collides with robot B, What is the final velocity of robot B
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