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A rocket with a mass of 2.9×10^6 kg has a relativistic kinetic energy of 2.5×10^23 J.
How fast is the rocket moving?
A machine is driven by a series of gears. The first gear has 12 teeth and rotates 25.0 times per minute. How many teeth does it have
A rectangular coil 21cm by 37cm has 100 turns. This coil produces a maximum emf of 69V when it rotates with an angular speed of 200rad/s in a magnetic field of strength B
A refrigerator has a 1000 W compressor, but the compressor runs only 20% of the time, If electricity costs $0.10/kWh, what is the monthly (30 day) cost of running the refrigerator
a cylindrical wheel is rotating with a constant angular acceleration of 4.0 rad/s^2. At the instant it reaches an angular speed of 2.0 rad/s, What is the radius of the wheel
A spring has a spring constant k = 0.84 N/m. If it is stretched 0.13 m from its equilibrium position, what is the restoring force of the spring
If the barge can only be pushed 18 cm deeper into the water before water overflows to sink it, how many 400 kg horses can it carry.
A 53.0-kg person jumps from rest from the top of a 10.0-m-high tower straight down into the water. Determine the magnitude of the average force that the water exerts on the diver
A car of mass 1.8 x10^3 kg is travelling east at a speed of 28m/s along a horizontal roadway. When its brakes are applied, the car stops in 5.8s. What is the average horizontal force exerted on the car even as it is braking.
consider the case of a wooden block moving along a horizontal track, how much is the change in mechanical energy
A typical adult ear has a surface area of 1.45 × 10-3 m2. The sound intensity during a normal conversation is about 2.49 × 10-6 W/m2 at the listener's ear. How much power is intercepted by the ear
A 300g rock tied to a string is rotated in a vertical circle (up and down, so gravity is important) with radius 0.5m. what is the rotation rate of the rock
1. given the energy range of a radiation source to be 0.5 ev. calculate the same energy range in joules. dont use the
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