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1. If vector U= 3i + 4j, vector V= 5 k and vector W= 4i - 3j, find the angle between U and V-W . 2. At the same time that ball X rolls off a platform on an airless extra-solar planet 8.00 meters high at a speed of 6.00 m/s, ball Y is dropped from the edge of the platform. Ball Y hits the ground after 1.00 second. Find g on this extra-solar planet. 3. The mass of ball X is 12.0 kilograms and the mass of ball Y is 9.0 kilograms. Find the momentum of ball X and the momentum of ball Y in problem 2 at the time when ball X hits the ground. 4. Find the gravitational forces of a) the planet on ball X, b) ball X on ball Y, c) ball Y on ball X and d) ball Y on the planet at the time when ball Y hits the ground.
You irradiate some tumor cells with X rays in a pure nitrogen atmosphere and you find that 10% of the cells survive a dose of 8 Gy. In air 90% of these cells die after 3 Gy of X rays. What is the Oxygen Enhancement Ratio for these cells?
As we've seen, astronauts measure their mass by measuring the period of oscillation when sitting in a chair connected to a spring. What is the mass of an astronaut who oscillates with a period of 2.15s when sitting in the chair
An SUV of mass 1.80 * 103 kg is traveling eastboundat 15m/s when it collides witha compact car (mass 900 kg )traveling westbound at -15 m/s. What is the change in kinetic energy of the two-car system
A 100 kg rocket moving radially outward from Earth has a speed of 4 km/s as its engine shuts off 200 km above Earth's surface.
a train moving with constant velocity travels 170 m north in 12 s and an undetermined distance to the west. the speed
Two Automobiles traveling at right angles to each other collide and stick together. Car A has a mass of 1200 kg and had a speed of 25 m/s before the collision, What was the speed of car B before the collision
Suppose that a 1 kg standard body accelerates at 4.00 m/s^2 at 160 degrees from the positive direction of the x-axis, owing to two forces, What is the magnitude and direction of the second force
A 6.00 V lantern battery is connected to a 10.5 (ohm) lightbulb, What is the internal resistance of the battery
A ray of light is traveling in a glass cube that is totally immersed in water. What is the refractive index of the glass
The particles are as follows: 10 uC at x = 0, y = 0; -5 uC at x = 20, y = 0; -15 uC at x = 20, y = 20; What is the electric field at the center of the square
A small glider is placed against acompressed spring at the bottom of an air track that slopes upwardat an angle of 33.0 degrees above the horizontal. The glider has mass 7.00×10−2 kg. The spring has600 N/m and negligible mass.
A ball is thrown from an upper story window of a building. Find from what height above ground, was the ball thrown
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