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At what position should a 75.0 gram mass be suspended to put the system in equilibrium?(b.)what mass would have to be at the 90.0 cm position for the system of the equilibrium?
Birds resting on high-voltage power lines are a common sight. A certain copper power line carries a current of 130 A. What is the potential difference across the bird's feet?
A rock is suspended from a string and moves downward at constant speed. Which statement is true concerning the tension in the string if air resistance is ignored?
A roller coaster is towed up an incline at a steady speed of 0.50 m/s by a chain parallel to the surface of the incline. The slope is 3.0 %, which means that the elevation increases by 3.0 m for ev
Three ropes are attached to a small ring. Two of the ropes are attached to walls at right angles with tensions of 80 N north wall, 50 N west wall. What are the magnitude and direction of the tension
The cross section of its muscle would increase by 1 0002 and the length of contraction would increase by 1 000. How high would this "superflea" be able to jump?
If the coefficient of kinetic friction between block and floor was 0.19, what were (a) the work done by the worker's force and (b) the increase in thermal energy of the block-floor system?
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?