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A horse canters away from its trainer in a straight line, moving 118 m away in 14.0 s. It then turns abruptly and gallops halfway back in 5.0 s. Find the average speed and velocity
A 87 arrow is fired from a bow whose string exerts an average force of 120N on the arrow over a distance of 78cm. What is the speed of the arrow as it leaves the bow?
A charge of -3.80 nC and a charge of -6.80 nC are separated by a distance of 40.0 cm. Find the position at which a third charge of +7.60 nC can be placed so that the net electrostatic force on it i
What is the work of lift with weight = 1.29×10^3 kg accelerating uniformly from rest to 10.8 m/s in 2.10 s.
A student examines a ladybug using a magnifying glass with focal length of 5.0 cm. He holds the magnifying glass 3.5 cm above the ladybug. What is the magnification?
The barrel has a length of 0.60 m and an opening whose radius is 2.8 10-3 m. A bullet (mass = 2.7 10-3 kg) has a speed of 380 m/s after passing through this barrel. Ignore friction and determine the
For instance, we have an isolated spherical capacitor on an insulating rod with a conducting base. Why do you get the most accurate vale for capacitance when applying a guard voltage to the base and
A car was seen driving off the edge of a cliff at an angle of 10.° above the horizontal. The cliff is 95. m high and the car impacted the ground at a distance of 156. m from the base of the cli
Clifford is in a real hurry, however, and skips the speedramp. Starting from rest with an acceleration of 0.39 m/s2, he covers the same distance as the ramp does, but in one-fourth the time. What is
A small piece of dust of mass m = 1.4 g travels horizontally through an electric air cleaner in which the electric field is 495 N/C. The electric force on the particle is equal to the weight of the
A model rocket is lauched straight upward with an initial speed of 80.0 m/s. it accelerates with a constant acceleration of 2.00 m/s^2 until its engines stop at an attitude of 200 m. the rocket cont
What is the potencial energy of an elevator with a mass of 8.00x 10^2 kg at the top of manila hotel, 3.80 m. above the street level?
An object is found to move with an acceleration of magnitude 8 m/s2 when it is subjected to a force of magnitude 222 N. Find the mass of the object.
An athlete at the gym holds a 1.2 kg steel ball in his hand. His arm is 64 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, but
The vertical component of this force is 128 newtons, while the horizontal component is 145 newtons. Calculate the magnitude of F.
When the galvanometer in a wheatstone bridge circuit shows no deflection, why are the voltages across opposite branches on each side of the galvanometer necessarily equal?
A thin stick of mass M = 4.3 kg and length L = 1.4 m is hinged at the top. A piece of clay, mass m = 0.5 kg and velocity V = 0.8 m/s hits the stick a distance x = 0.75 m from the hinge and sticks t
A grocery cart with a mass of 13 kg is being pushed at a constant speed up a flat 16 degree ramp by a force Fp which acts at an angle of 17 degrees below the horizontal. Find the work done by the: (
A swimmer slides freely from rest from the top of a water slide and reaches the bottom with a horizontal speed. He hits the water 4.6 meters from the slide 0.8 second later. Find the length of the s
A 250 gram sample of a metal is warmed from 60 °C to 85 °C when 1000 cal are added. What is the specific heat constant for the metal?
Having landed on a newly discovered planet, an astronaut sets up a simple pendulum of length 1.17 m and finds that it makes 577 complete oscillations in 1590 s. The amplitude of the oscillations is
The driver of an 2000 kg car traveling at 20.0 m/s slams on the brakes, locking the wheels on the dry pavement. The coefficient of kinetic friction between rubber and dry concrete is typically 0.65
A 2.1 by 10 to the power of 3 kg car starts from rest at the top of a driveway that is sloped at an angle of 20.0 with the horizontal. An average friction force of 4.0 by 10 to the power of 3 N impe
Find the magnitude and direction of the resultant force, given the vertical component of a force vector is 580 N and the horizontal component is 200 N.
A vertical electric field of magnitude 1.80x10^4 N/C exits above the Earth's surface on a stormy day. A car with a rectangular size of 5.50m by 2.00m is traveling along the horizontal roadway. Find