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Q. A 2kg rock is released from rest at a height of 29m. ignore air resistance and determine the kinetic energy, gravitational potential energy, and total mechanical energy at each of the following heights: 20m; 15m; 5m; 9m.
Q. If the effective wavelength were 3.9 x 10^3 Earth radii, what would be the (a) frequency and (b) period of the radiation emitted? Ordinarily, electromagnetic radiations do not penetrate very far into conductors such as seawater. Take the Earth's radius to be 6370 km.
What friction torque is necessary to reduce its angular speed from 90.0 {rm rpm} to 45.0 {rm rpm} in a time interval of 32.0 {rm s}.
The maximum distance from Earth to the Sun (at our aphelion) is 1.521 x 10^11 m and the distance of closest approach (at perihelion) is 1.471 x 10 ^11 m. Assume the Earth's orbital speed at perihelion is 3.027 x 10 ^ 4 m/s. (overlook the effect of th..
A stone is thrown vertically upward with a speed of 12.3 m/s from the edge of a cliff 84.6m high. What is the speed just before hitting.
our little sister builds 2 tree houses and stretches a rope between them for sending messages to other tree house. She hangs a mass of 1.4kg on one end of the rope that passes over the pulley.
On a dry day, just after washing your hair to remove natural oils and drying it in detail, run a plastic comb through it. Small bits of paper will be attracted to the comb. Describe why.
A space traveller whose mass is 104kg leaves earth. What are his weight and masson earth and in interplanetary space where there are no near planetary objects.
On your wedding day your lover gives you a gold ring of mass 3.98 g. 59 years later its mass is 3.73 g. On the average how many atoms were abrated from the ring during each second of your marriage? The atomic mass of gold is 177 u.
If a ball is thrown upwards at 20 ft/sec, the height h after t seconds is given by h = -16t^2 + 20t. How many seconds does it take for the ball to reach its greatest height, and what is this height.
What value of capacitance will ensure that an output voltage stays within 3 percent of the rated 22v . find an electric field between them and surface charge density on the plate.
A woman rides a carnival Ferris wheel at radius 16.0 m, completing 4.40 turns about its horizontal axis every minute. What are (a) period of the motion, and the magnitude of her centripetal acceleration at (b) highest point and (c) lowest point.
A child in danger of drowning in a river is being carried downstream by a current that has a speed of 2.75 km/hr. The child is 0.560 km from shore and 0.750 km upstream of a boat landing when a rescue boat sets out. If the boat proceeds at its maximu..
Compute Earth's gravitational force on the Shuttle astronauts while orbiting at an altitude of 220 miles (or 354 km) above Earth's surface.
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