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Q. What are the two main mechanisms that the planet Earth uses to balance water that goes up with the water that comes down over Earth?
Q. A rocket of total mass 3700 kg is travelling in outer space with a velocity of 110 m/s toward the Sun. It wishes to alter its course by 35.0 degrees, and can do this by firing its rockets briefly in a direction perpendicular to its original motion. If the rocket gases are expelled at a speed of 1900 m/s, how much mass must be expelled?
A person weighs 689 N and the head is 53 N the average density of the person is 1010 kg/cubed meters how much force in N is required to keep a persons head out of the water.
They then turn together around the spindle with their centers superposed. What is an angular frequency in of the combination.
A car is behind a truck going 25m/s on the highway. The car's driver looks for an opportunity to pass, guessing that his car can accelerate at 1.0m/s2. He gauges that he has to cover the 20-m length of the truck, plus 10m clear room at the rear of..
The tape is now wound back into the drum at angular rate. With what speed would the end of the tape move? (Note that our drawing specifies that a positive derivative of implies motion away from the drum. Be careful with your signs. The fact that the ..
A car is traveling at 29m/s when the driver spots a large pothole in the road the distance 37 m ahead. She immediately applies her brakes. If her acceleration is -6.60m/s2, does she manage to stop before reaching pothole.
How much friction must be exerted between the skates and ice.
If the ball's speed just before impact is 100 m/s, what is the angular speed of the rod immediately after the collision.
A car rounds a banked curve. The radius of curvature of the road is R .the banking angle is a. the coefficient static friction is f.
A block of mass M is held motionless on a frictionless inclined plane by means of a string attached to a vertical wall as shown in the diagram.what is the magnitude of the tension t in string.
If the coefficient of friction between road and tires on a rainy day is 0.100, what is the minimum distance in which the car will stop?
what is the kinetic energy of the system. assume the roller coaster in Fig. 6-41 (h1 = 36 m, h2 = 14 m, h3 = 25) passes point 1 with a speed of 2.00 m/s. If the average force of friction is equal to one sixth of its weight, with what speed will it ..
A ball has fallen to the street below, and a passerby returns it by launching it at an angle of 53.0° above the horizontal at a point 26.0 m from the base of the building wall. The ball takes 2.20 s to reach a point vertically above the wall.
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