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A sledge loaded with bricks has a total mass of 17.1kg and its is pulled at constant speed by a rope inclined at 20.0 degrees above the horizontal. the sledge moves a distance of 20.8 m on a horizontal surface. The coefficient of kinetic friction between the sledge and surface is 0.500. A. what is the tension in the rope. B. how much work is done by the rope on the sledge? c. what is the mechanical energy lost due to friction?
Periodic signals from three pulsars reach the Earth. Signals from the first pulsar, denoted A, have a frequency of 400 Hz and come from a direction 10 degrees away from the direction of the galactic center.
During a running long jump, an athlete runs with a speed of 9 m/s horizontally and, upon take off, how far will the athlete jump
The index of refraction for red light in water is 1.331 and that for blue light is 1.340. what are the underwater angles of refraction for the blue and red components of the light
The Moon is 3476 km in diameter and orbits the Earth at an average distance of 384,400 km. What is the angular size in radians of the Moon as seen from Earth
A 7320 kg satellite has an elliptical orbit. The point on the orbit that is farthest from the earth is called the apogee and is at the far right side of the drawing. Find the work done by the gravitational force when the satellite moves from the ap..
A force acting on an object moving along the x axis is given by Fx = (14x ? 3.0x2) N, How much work is done by this force as the object moves from x = ?2.0 m to x = +1.0 m
A 13-kg block rests on a level floor. A 300-g glob of putty is thrown at the block so that the putty travels horizontally, hits the block, what is the initial speed of the putty
Three people pull simultaneously on a stubborn donkey. Jack pulls eastward with a force of 79.1 N, Jill pulls with 76.7 N in the northeast direction, Find the magnitude of the net force the people exert on the donkey
a 2kg mass ona horizontal frictionless surface is attached to the free end of an ideal spring of stiffness k=30N/m. by what distance is the spring compressed as the mass comes to rest again
Red light from three separate sources passes through a diffraction grating with 5.50×105 lines/m. Calculate the first-order diffraction lines of each ot these sources
A woman holds a tube of lipstick 9 cm from a spherical mirror and notices that the image of the tube is upright and one fourth its normal size. Calculate the focal length of the mirror
In an experiment, 210 g of aluminum (with a specific heat of 900 J/kg·K) at 100°C is mixed with 48.0 g of water (4186 J/kg·K) at 20°C, What is the entropy change of the aluminum
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