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Whenever two Apollo astronauts were on the surface of the Moon, a third astronaut orbited the Moon. Assume the orbit to be circular and 240 km above the surface of the Moon, where the acceleration
A piece of wire with mass per unit length 84 g/m runs horizontally at right angles to a horizontal magnetic field. A 6.5A current in the wire results in its being suspended against gravity.
The weight of passengers on a roller coaster increases by 58 as the car goes through a dip with a 40 radius of curvature. What is the velocity of the cart at the bottom of the track?
A 4.30 102 kg hot-air balloon takes off from rest at the surface of the earth. The nonconservative wind and lift forces take the balloon up, doing +9.70 104 J of work on the balloon in the process.
The magnetic field of earth at a certain location is directed vertically downward and has a magnitude of 50microT. Find the direction and magnitude of magnetic force the field exerts on the proton?
A 114g puck is traveling at an initial speed of 6.7m/s and stops in 18 m due to friction of the ice. What is the magnitude of the friction force? What is the coefficeint of kinetic friction between
You may also assume that v_0 gg sqrt{2gL}, so that the change in the hammer's gravitational potential energy, as it drives the nail into the block, is insignificant. Express the magnitude of the for
When radiation with a wavelength of 142 nm shines on the surface, what is the maximum speed of the ejected electrons?
A woman rides a carnival Ferris wheel at radius 17 m, completing 4.3 turns about its horizontal axis every minute. What are (a) the period of the motion, and the magnitude of her centripetal accele
What is the apparent distance from the upper benzene surface to the bottom of the water layer when it is viewed at normal incidence?
A flashlight on the bottom of a 4.00 m deep swimming pool sends a ray upward and at an angle so that the ray strikes the surface of the water 1.70 m from the point directly above the flashlight. Wh
Assume that a ray is incident at an angle of 30.0° (relative to the normal) on a film with an index of refraction 1.33. Calculate the minimum thickness for constructive interference of visible l
A 15.0 {rm kg} rock slides on a rough horizontal surface at 6.00 {rm m/s} and eventually stops due to friction. The coefficient of kinetic friction between the rock and the surface is 0.200.
Now, when both pipes vibrate at their fundamental frequencies, a beat frequency of 11.1 Hz is heard. How many centimeters were cut off the end of the second pipe? The speed of sound is 343 m/s.
A 22 cm diameter bowling ball has a terminal speed of 77m/s. What is the mass of the ball?
What is a sudden pulling force in physics? I'm doing crossword puzzle. The first letter is "l" and the third letter is "r". It has five letters.
A tennis player receives a shot with the ball of mass 0.060kg traveling horizontally at v=43 m/s and returns the shot with the ball traveling horizontally at 60 m/s in the opposite direction. (a) W
The first atomic bomb released energy equivalent to 20 kilotons of TNT. If 1 ton of TNT releases 4x109 J, how much uranium was consumed through fission in the bomb?
Suppose a planet had a density that varied with radius according to the equation, ρ =A/r, where A is some constant. Determine a formula that gives the central pressure for this type of planet.
Two friends, Al and Jo, have a combined mass of 136 kg. At an ice skating rink they stand close together on skates, at rest and facing each other, with a compressed spring between them. The spring i
It has been estimated that the Earth contains 109 metric tons of natural uranium that can be mined economically. How many atoms of 235U are there in 109 metric tons of natural uranium?
A uniform electric field witha magnitude of 250 N/C is directed in the positive xdirection. A 12 uC charge moves from the origin to the point(20.0 cm, 50.0 cm). What is the change in the electrical
If the create has a mass of 110 and is 1.6 tall and 0.80 in depth and width, what is the minimum force needed to make the crate start tipping? (Assume the center of mass of the crate is at its cente
A cylindrical container with a cross-sectional area of 66.2 holds a fluid of density 816kg/m3, and the bottom of the container the pressure is 118 kPa. What is the depth of the fluid?
By how many degrees has your coffee cooled once the ice has melted and equilibrium is reached? treat the coffee as though it were water and neglect energy exchanges with the environment.