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Question1
A professor's office door is 0.92 {rm m} wide, 2.0 {rm m} high, 4.0 {rm cm} broad; has a mass of 25 {rm kg}, and pivots on frictionless hinges. A "door closer" is attached to door and the top of the door frame. As door is open and at rest, the door closer exerts a torque of 4.9 {rm N}cdot {rm m}.
A: What is moment of inertia of the door?
B: If you let go of the open door, what is its angular acceleration immediately afterward?
Question2
The picture tube in an old black-and-white television uses magnetic deflection coils rather than electric deflection plates. Assume an electron beam is accelerated through a 50.0-kV potential difference and then throughout a region of uniform magnetic field 1.00 cm wide. The screen is located 10.0 cm from the center of the coils and is 50.0 cm wide. When field is turned off, the electron beam hits the center of the screen. Ignoring relativistic corrections, what field magnitude is essential to deflect the beam to the side of the screen?
A charge of -250e is uniformly spread through the volume of a sphere of radius 2.00 cm. What is the volume charge density in that sphere
A 64.0-kg person holding two 0.750-kg bricks stands on a 2.20-kg skateboard. Initially, the skateboard and the person are at rest. What is the recoil speed of the person
1400 kg car acelerates from 45mph (20.1 m/s) to 65mph (29.1m/s) over a distance of 440 m in 35 s. what is the network done on the car by all forces acting on it
What are the size and direction of the change in velocity if the initial velocity is 6 m/s south and the final velocity is 2 m/s west?
W hat is the velocity of the gasoline in the tube
What is the width of a single slit that produces its first minimum at 60.0° for 580 nm light, Using the slit from part (a), find the wavelength of light that has its first minimum at 62.5°
At the moment of ignition the mass of a rocket is 100 kg. For the first 10 s it burns fuel at the rate of 5 kg/s. find The magnitude of the force developed by its engine
An atom has only two levels, a ground state with energy -25.0 eV, What wavelength photon is required for stimulated emission of an electron in the excited state
A light bulb is wired in series with a 122-? resistor, and they are connected across a 120.0-V source. What is the resistance of the light bulb
Two ocean liners, each with a mass of 38,000 metric tons, are moving on parallel courses, 92 m apart. What is the magnitude of the acceleration of one of the liners toward the other due to their mutual gravitational attraction? Treat the ships as par..
A 2.00 kg block is pushed against a spring with negligible mass and force constant k=400 N/m, compressing it 0.220m. When the block is released, it moves along a frictionless,
A silt of width a is illuminated bymonochromatic light of wavelength 650nm at normal incidence. Calculate the value of a , when the first minimum falls at an angle of diffracction 30 degree
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