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A 14 kilogram box slides down a long, frictionless incline of angle 30 degree. It starts from rest at time t = 0 at the top of the incline at a height of 21 meter above ground.
(a) Find the original potential energy of the box relative to the ground?
(b) From Newton's laws, calculate the distance the box travels in 1 second and its speed at t = 1 second.
(c) Calculate the potential energy and the kinetic energy of the box at t = 1 second.
(d) Calculate the kinetic energy and the speed of the box just as it reaches the bottom of the incline.
charge of -2.95 µC is fixed at the center of a compass. Two additional charges are fixed on the circle of the compass, which has a radius of 0.097 m. The charges on the circle are -3.85 µC at the position due north and +5.20 µC at the position due ea..
A 12.5-kg block of ice has a temperature of -18.4 °C. The pressure is one atmosphere. The block absorbs 7.62 x 106J of heat. What is the final temperature in degrees Celsius of the liquid water?
Oppositely charged parallel plates are separated by 4.52 mm. A potential difference of 600 V exists between the plates. (a) What is the magnitude of the electric field between the plates?
a series RLC circuit has a resistance of 500 ohms, and inductance of 20.0 mH, and a capacitance of 2.00 uF. what is the peak current in this circuit
Light shines during a single slit whose width is 4.60*10-4 m. A diffraction pattern is formed on a flat screen located 3.8 m away. The distance among the middle of the central bright fringe and the first dark fringe is 6.50 mm. What is the wavelength..
Find the radius R of the star Rigel, the bright blue star in the constellation Orion, which radiates energy at a rate of 2.7×1032 W
When the Mars rover was deployed on the surface of Mars in July 1997, radio signals took about 12.1 min to travel from Earth to the rover. How far was Mars from Earth at that time
A 20.0- projectile is fired at an angle of 60.0 above the horizontal with a speed of 80.0 . At the highest point of its trajectory, the projectile explodes into two fragments with equal mass, one of which falls vertically with zero initial speed.
Treating the pulley as a uniform disk, determine the speeds of the two objects as they pass each other.
An object initially at rest explodes in two fragments of masses 3.5 kg and 6.3 kg that move in diametrically opposite directions. find the internal energy of the explosion
the drawing shows an equilateral triangle each side of which has a length of 2.87 cm. point charges are fixed to each
if you are in a roller coaster, which is moving with 10m/s, describing a circular arc with the radius of 10m, what is the force pushing you in the chair at the top of the loop
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