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A motorist drives north for 39.0 minutes at 88.5 km/h and then stops for 15.0 minutes. He then continues north, traveling 130 km in 1.80 h. What is his total displacement?
The cannonball is fired at a speed of 52 m/s and at an angle of 28°. A second cannonball that was accidentally dropped hits the moat below in 1.6 s. How tall is the top of the castle wall?
Jack and Jill are on two different floors of their high rise office building and looking out of their respective windows. Jack sees a flower pot go past his window ledge and Jill sees the same pot g
A 19kg child sits in a swing supported by two chains each 3m long. If tension in each chain at the lowest point is 140N find the childs speed at the lowest point.
Determine (a) how long it takes the first rock to hit the ground and (b) at what velocity it hits. Determine (c) how long it takes the second rock to hit the ground.
An object undergoes uniformly accelerated motion from point x1 = 3 m at time t1 = 2 s to point x2 = 42 m at time t2 = 7 s. (a) If the magnitude of the instantaneous velocity at t1 is v1 = 3 m/s, what
An athlete at the gym holds a 3.0 kg steel ball in his hand. His arm is 66 cm long and has a mass of 4.0 kg. What is the magnitude of the torque about his shoulder if he hold it straight out parall
Assume the electron described above is traveling at constant speed around a circular path with circumference 1.1 km. Compute the acceleration a of the electron in m s-2 and as a multiple of the gra
Janet jumps off a high diving platform with a horizontal velocity of 2.47 m/s and lands in the water 2.3 s later. The acceleration of gravity is 9.8 m/s2 . How high is the platform? Answer in units
How much time will it take for the police officer to reach the speeder, assuming that the speeder maintains a constant speed? How fast will the police officer be traveling at this time?
A) After the system is released, find the horizontal tension in the wire. B) After the system is released, find the vertical tension in the wire.
A 0.109 kg rock is attached to a 1.94 m long string and swung in a horizontal circle at a speed of 28.2 m/s. Find the tension in the string. Neglect the effect of gravity.
If the accelerating plates are 1.05 apart, and have a potential difference of 2.70×104 , find the change in electric potential energy for an electron that moves from one accelerating plate to
A 20.0 rock slides on a rough horizontal surface at 9.00 and eventually stops due to friction. The coefficient of kinetic friction between the rock and the surface is 0.200.
The Symbol for a certain isotope of radium is 226 Ra 88. How many nucleons are there in the nucleus of this isotope?
The traces of the rain on the side windows of the car make an angle of 75.0° with the vertical. Find the velocity of the rain with respect to the following reference frames.
A rotating door is made from four rectangular sections, as indicated in the drawing. The mass of each section is 80 kg. A person pushes on the outer edge of one section with a force of F = 72 N tha
Light is diffracted when it passes through a narrow single slit. What happens to the width of the central maxium in the diffractino pattern when the width of the slit trough which ight passes is red
The base of the cliff directly under their launch point. what minnimum push off speed is necessary to clear the rocks? how long are they in the air?
The surrounding conductor is a cylindrical shell and has an inner diameter of9.989 mm and a charge of -11.03 μC. Assume the region between the conductors is air. The Coulomb constant is 8.98755 &
A cannon shoots a ball with an initial velocity of 152 m/s and a launch angle of 62°. The gravitational acceleration is 9.8 m/s2. Assuming no air resistance, how long will the cannonball stay i
Using a force of 28.0 Newton, a student pulls a 70.0 Newtons weight along the table top for a distance of 15.0 meter in 3.0 seconds. Compute the power developed by the student.
The pulley system shown in the figure is used to lift a 52-{rm kg} crate. Note that one chain connects the upper pulley to the ceiling and a second chain connects the lower pulley to the crate. Ass
A sealed tank containing seawater to a height of 12.2 also contains air above the water at a gauge pressure of 3.2. Water flows out from the bottom through a small hole. How fast is the water movin
If the projectile rises to a maximum height of only 14.7 m, determine the magnitude of the average force due to air resistance.