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Q1. A piece of granite is thrown upward with a speed of 25 m/s from a cliff that is 80 m high. How much time goes by before it hits the water below? What is its velocity at impact? What will its average velocity be? What will its average speed be?
Q2. A trapeze artist swings in straightforward harmonic motion with a period of 3.8 s. rodriguez (ar38765) - Homework 05 - luers - (38911) 2
The acceleration of gravity is 9.81 m/s2 .
Estimate the length of the cables supporting the trapeze.
Answer in units of m.
Q3. The tungsten filament of an assured 100 W light bulb radiates 3.50 W of light. (The other 96.5 W is carried away by convection and conduction.) The filament has surface area of 0.310 mm2 and an emissivity of 0.950. Find out the filament's temperature. (The melting point of tungsten is 3683 K)
Two point charges q and 4q are at x=0 and x=L, respectively, and free to move. A third charge is placed so that the entire three-charge system is in static equilibrium. What is the magnitude of the third charge
A spacecraft is traveling with a velocity of v0x = 4330 m/s along the +x direction. Two engines are turned on for a time of 728 s. One engine gives the spacecraft an acceleration in the +x direction of ax = 1.74 m/s2.
A small rocket to gather weather data is launched straight up. Several seconds into the flight, its velocity is 120 m/s, What is the net force on the rocket
a 325kg object, initially moving at 7.50 m/s, to a final velocity of 28.5 m/s in 16.5 seconds. What was the change in kinetic energy of the object
A toy car runs off the edge of the table that is 1.6405 m high. The car lands 0.3311 m from the base of the table how long does it take for the car to fall? The acceleration by reason of gravity is 9.80 m/s2.
The rotor in a certain electric motor is a flat, rectangular coil with 82 turns of wire and dimensions 2.25 cm by 3.88 cm. The rotor rotates in a uniform magnetic field of 0.800 T. Find the maximum torque acting on the rotor
A light source emits a beam of photons, each of which has a momentum of 2.3 ?? 10??29 kg??m/s. What is the frequency of the photons
What is the charge q. suppose the speed of sound in air to be 343 m/s.
A bicyclist climbs a hill 17 m tall and then coasts down the other side without pedaling. If the cyclist's speed was 2.5 m/s at the top, what is it at the bottom (ignoring friction)?
Two runners of mass 70kg and 60kg, respectively, have a total linear momentum of 350 kg•m/s. The heavier runner is running at 2.0 m/s. Determine the likely speeds of the lighter runner.
Velocity has a magnitude and a vector. consider a boat moving initally with velocity of 30 m/s directly west. What is the change in velocity
A ball rolls off a platform that is 6.8 meters above the ground. The ball's horizontal velocity as it leaves the platform is 7.4 m/s.How much time does it take for the ball to hit the ground
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