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A 4.00-kg model rocket is launched, expelling 49.0 g of burned fuel from its exhaust at a speed of 555 m/s. What is the velocity of the rocket after the fuel has burned?
A place kicker must kick a football from a pint 35m from the goal. as a result , the ball must clear the crossbar, which is 3.05m high. when kicked, the ball leaves the ground with a speed of 20 m/s
Three equal point charges, each with charge 1.10 , are placed at the vertices of an equilateral triangle whose sides are of length 0.200 . What is the electric potential energy of the system? (Take
The proper length of one spaceship is three times that of another. The two spaceships are traveling in the same direction and, while both are passing overhead, an Earth observer measures the two sp
A car starts from rest on a curve with a radius of 190 m and accelerates at 0.400 m/s^2. How many revolutions will the car have gone through when the magnitude of its total acceleration is 2.00 m/s^
A 4 kg object is attached to a spring with a spring constant of 10 N/m. The object is displaced 5 cm from the equilibrium position and let go. What is the frequency of the vibration?
A car travels due east with a speed of 50.0 km/h. Raindrops are falling at a constant speed vertically with respect to the Earth. The traces of the rain on the side windows of the car make an angle
An airplane is flying with a ground speed of 125 km/hr on a true course of 245 degrees. If the plane has an air speed of 145 km/hr and is on a heading of 20 degrees, what is the wind speed and direc
Some gliders are launched from the ground by means of a winch, which rapidly reels in a towing cable attached to the glider. What average power must the winch supply in order to accelerate a 174-kg
A gas is compressed under isobaric conditions, and its volume changes from 9.0 10-3 to 2.0 10-3 m3. The pressure of the gas is 1.0 105 Pa.
A village maintains a large tank with an open top, containing water for emergencies. The water can drain from the tank through a hose of diameter 6.65 cm. The hose ends with a nozzle of diameter 2.5
When one gallon of gasoline is burned in a car engine, 1.22 108 J of internal energy is released. Suppose that 1.05 108 J of this energy flows directly into the surroundings (engine block and exhaus
A 200 weather rocket is loaded with 100 kg of fuel and fired straight up. It accelerates upward at 30 m/s^2 for 33 s, then runs out of fuel. Ignore any air resistance effects. What is the rocket's m
A 62 kg solid cylinder, 3.27 m long and with an end radius of 4.1 cm, stands on one end. How much pressure does it exert? The acceleration of gravity is 9.8.
A 15 g rifle bullet traveling 245 m/s buries itself in a 3.9 kg pendulum hanging on a 2.7 m long string, which makes the pendulum swing upward in an arc. Determine the vertical and horizontal compo
What happens to the angular velocity of a rotating platform as a person walks from the outer rim of the platform toward the center of the platform?
The mass of a robot is 5200 kg. This robot weighs 3750 N more on planet A than it does on planet B. Both planets have the same radius of 1.33 107 m. What is the difference MA - MB in the masses of t
A herd of wild horses races across the flat, open plains of the Great Basin in central Nevada. If the horses are running at 12.1 m/s at a compass heading of 286 degrees, what is the northward compon
While running, a person dissipates about 0.593 J of mechanical energy per step per kilogram of body mass. If a 62.6 kg runner dissipates a power of 60.9 W during a race, how fast is the person runn
How much heat is absorbed by a persons hand if 100 grams of steam at 100°C is first converted to liquid water at 100°C and then cooled to normal body temperature?
A 430 g football is lying on the ground, then is kicked and is moving at 25 m/s. If the duration of the impact was 0.0010 s, what was the average force on the ball?
During the spin-dry cycle of a washing machine, the motor slows from 80 rad/s to 40rad/s while the turning the drum through an angle of 120 radians. What is the magnitude of the angular acceleration
A space vehicle is traveling at 4000 km/h relative to the Earth when the exhausted rocket motor is disengaged and sent backward with a speed of 88 km/h relative to the command module. The mass of t