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A man racing his son has half the kinetic energy of the son, who has half the mass of the father. the man speeds up by 0.8 m/s and then has the same kinetic energy as the son. What were the original
An athlete at the gym holds a 2.0 kg steel ball in his hand. His arm is 70 cm long and has a mass of 4.0 kg. What is the magnitude of the torque about his shoulder if he holds his arm straight out
The difference in potential between the accelerating plates of a TV set is about 26000 V. If the distance between these plates is 1.50 cm, find the magnitude of the uniform electric field in this r
Two identical piano wires have a fundamental frequency of 600Hz when kept under the same tension. What fractional increase in the tension of one wire lead to the occurrence of 6 beats/s when both wi
On level ground a shell is fired with an initial velocity of 74.6 at 61.1 above the horizontal and feels no appreciable air resistance.At its highest point, find the horizontal and vertical compone
Find the number of revolutions of a bicycle wheel of diameter 0.7 m when the bike goes a distance of 22 m down the street.
The brochure advertising a sports car states that the car can be moving at 100.0 km/h, and stop in 37.19 meters. What is its average acceleration during a stop from that velocity? Express your answe
A 10 m long, 200g rod with uniform mass distribution is hinged at one end and connected to a wall. It is held horizontally, and then released. What is the speed of the tip of the rod as it hits the
A trapeze artist swings in simple harmonic motion with a period of 4.4s. The acceleration of gravity is 9.81 m/s2. Calculate the length of the calbes supporting the trapeze.
A train is traveling up a 3.3 incline at a speed of 2.45 when the last car breaks free and begins to coast without friction. How long does it take for the last car to come to rest momentarily?
After the block is released, it leaves the spring and continues to travel upwards. What height above the point of release will the block reach if air.
A hunter wishes to cross a river that is 2.4 km wide and that flows with a speed of 6.0 km/h. The hunter uses a small powerboat that moves at a maximum speed of 9.5 km/h with respect to the water. W
Suppose 3 mol of neon (an ideal monatomic gas) at STP are compressed slowly and isothermally to 0.25 the original volume. The gas is then allowed to expand quickly and adiabatically back to its ori
Find expressions for the phase evolution during time throughout the experiment using the boundary condition that phase is zero when the magnetization vector M is parallel to y'.
A proton orbits just at the surface of a charged sphere of radius 0.83 cm. If the speed of the proton is 4.96 X105 m/s, what is the charge on the sphere?
Write down an expression for the vertical velocity w(z) in terms of the constant S, the funnel radius r(z), and the density of water rhow (also constant). Pay attention to units. You can use rhow =
A car drives north at 46 for 10 and then turns east and goes 5.0 at 60 . Finally, it goes southwest at 30 for 6.0. What is the average velocity?
If the coefficient of friction between the road and the tires on a rainy day is 0.1, what is the minimum distance in which the car will stop? What is the stopping distance when the road is dry and t
What friction force must act on the bottom of the ladder to keep it from slipping? Neglect the (small) friction force between the smooth wall and the ladder.
The helical molecule acts like a spring and compresses 1.23% upon becoming charged. Determine the effective spring constant of the molecule.
If electrical energy costs $0.080/kWh, what does it cost to raise the 200 kg of water in the tank from 15 degrees Celsius to 80 degrees Celsius?
A car is moving down a street at 59 km/h. A child suddenly runs into the street. If it takes the driver 0.80 s to react and apply the brakes, how many meters will the car have moved before it begin
At t = 5.0 seconds, the cheetah is standing still, having knocked over the gazelle. What is the average acceleration of the cheetah from t = 0 to t = 5.0 seconds?
What is the difference in blood pressure (mm-Hg)between the top of the head and bottom of the feet of a 1.60 m tall person standing vertically
An object is 9.27 cm from the surface of a reflective spherical Christmas tree ornament 8.38 cm in diameter. What is the position of the image?