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How many cubic meters of gas must be burned each day to maintain an inside temperature of 23.0°C if the outside temperature is 0.0°C? Disregard radiation and energy loss by heat through the
The first person is initially moving forward with a speed of 2.50 m/s, and the second person is initially at rest. What are the velocities of the two people after the snowball is exchanged? Disregar
if you exert a horizontal force of 200 N to slide a desk across an office floor at a constant velocity, how much friction does the floor exert on the desk? Is the force of friction equal and opposit
After the explosion one of the masses has a velocity of 3.0 m/s at an angle of 60° north of east. What is the magnitude of the velocity of the other mass after the explosion?
Suppose we have an infinitely long wire carrying a current of 4.0 A. It is bent into an L-shape extending into positive infinities along the x- and y- axes. Find the magnitude of the magnetic field
An 80kg runner accelerates out of the starting blocks at 2.0m/s squared. He reaches his top speed in 10 seconds. What force must the runner exert that he can achieve his acceleration?
A chair of mass 10.0 is sitting on the horizontal floor; the floor is not frictionless. You push on the chair with a force = 38.0 that is directed at an angle of 39.0 below the horizontal and the c
A long-distance power line that has a resistance of 90. What percentage of the power delivered by the generator is dissipated as heat in the power line?
Three equal point charges, each with charge 1.10 microcoulombs , are placed at the vertices of an equilateral triangle whose sides are of length 0.300 . What is the electric potential energy of the
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