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Q. A toaster rated at 1030 W operates on a 120 V household circuit and a 4.00 m length of Nichrome wire as its heating element. The operating temperature of this element is 340°C. What is the cross-sectional area of the wire? (m^2)
Q. An astronaut's normal weight it 600 newtons. How much will she weigh while orbiting in a satellite at 12,000 kilometers [two earth radii] above the surface of Earth?
A horizontal ray of light falls on a vertical plane mirror free to turn about the horizontal axis. If the mirror turns through 20o, by what angle does the reflected ray turn.
A playground merry go round of a diameter 6m and mass 240 kg is rotating at 12 rev/min about a frctionless vertical axle. Facing the axle, a 30kg child hops on to the merry go round and manages to sit down on its ledge. What is the new angular spe..
How much greater is an angular momentum of the Earth orbiting about the sun than the moon orbiting about the Earth? (Set up a ratio of angular momenta using data on inside back cover. The period of the moon is about 27.3 days.)
An artillery shell is fired with the initial velocity of 300 m/s at 54.7° above the horizontal. To clear an avalanche, it explodes on the mountainside 55.0 s after firing. What is the x and y components of the shell where it explodes, relative to its..
The gravitational force exerted on a baseball is 2.23 N down. A pitcher throws the ball horizontally with velocity 14.5 m/s by uniformly accelerating it along a straight horizontal line for a time interval of 169 ms. The ball starts from rest.
A 3.60 {rm m}-long, 430 {rm kg} steel beam extends horizontally from the point where it has been bolted to the framework of a new building under construction. A 66 {rm kg} construction worker stands at the far end of the beam.
The springs of a 1300 {rm kg} car compress 6.0 {rm mm} when its 62 {rm kg} driver gets into the driver's seat. If the car goes over a bump, what would be the frequency of vibrations.
A worker on a scaffolding 65 ft above the ground needs to lift a 390 lb bucket of cement from the ground to a point 30 ft above the ground by pulling on the rope weighting 2 lb/ft . Set up the integral of how much work is required (just give the i..
Assume someone drops an apple from a vertical distance of 6.0 meters, directly above the point where the arrow hits the tree.
A stone is dropped from the roof of a building; 2.10s after that a second stone is thrown straight down with the initial speed of 18 m/s, and both stones hit the ground at the equal time. How long did it take for the first stone to hit the ground.
A person with perfect pitch sits on the bus bench listening to the 442 Hz horn of an approaching car. If the person detects a frequency of 479 Hz, how fast is the car moving.
when the field is vertical to the plane of loop, when the field makes a 90.0 angle with the normal to plane.
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