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A 120-kg mail bag hangs by a vertical rope 3.5 m long. A postal worker then displaces the bag to a position 2.0 m sideways from its original position, always keeping the rope taut. (a) What horizon
A centrifuge in a medical laboratory rotates at an angular speed of 3 600 rev/min. When switched off, it rotates 50.0 times before coming to rest. Find the constant angular acceleration of the centr
What is the ratio of the maximum radial force on the laundry for the higher angular speed to that for the lower speed?
Our Sun is 2.3 x 104 ly (light-years) from the center of our Milky Way galaxy and is moving in a circle around that center at a speed of 250 km/s. (a) How long does it take the Sun to make one revolut
A car starts from rest and moves around a circular track of radius 30.0 m. Its speed increases at the constant rate of 0.500 m/s2
His partner, Tina (mass 50.0 kg), stands on an elevated platform located at the top of his trajectory. He grabs her as he flies by and the two fly off together. They land in a net at the same elevat
A river flows from south to north at 5.0 km/h. On this river, a boat is heading east to west perpendicular to the current at 7.0 km/h. As viewed by an eagle hovering at rest over the shore, how fast
A novice golfer on the green takes three strokes to sink the ball. The successive displacements are 4.00 m to the north, 2.00 m northeast, and 1.00 m at 30.0° west of south. Starting at the same
A roller coaster car moves 200 ft horizontally, and then rises 135 ft at an angle of 30.0° above the horizontal. It then travels 135 ft at an angle of 40.0° downward. What is its displacemen
Question: We want to position a space probe along a line that extends directly toward the Sun in order to monitor solar flares. How far from Earth's center is the point on the line where the Sun's g
Bones and muscles a patient in therapy has a forearm that weighs 20.5 N and that lifts a 112.0-N weight. These two forces have direction vertically downward. The only other significant forces on his
While exploring a cave, a spelunker starts at the entrance and moves the following distances. She goes 75.0 m north, 250 m east, 125 m at an angle 30.0° north of east, and 150 m south. Find the
An atom with mass m emits a photon of wavelength A. What is the kinetic energy K of the recoiling atom?
A string fixed at both ends is 8.40 m long and has a mass of 0.120 kg. It is subjected to a tension of 96.0 N and set oscillating. (a) What is the speed of the waves on the string?
Question: An object having mass 900 kg and traveling at speed 0.850c collides with a stationary object having mass 1 400 kg. The two objects stick together. Find
A friend passes by you in a spacecraft traveling at a high speed. He tells you that his craft is 20.0 m long and that the identically constructed craft you are sitting in is 19.0 m long. According t
Two students with vibrating 440-Hz tuning forks walk away from each other with equal speeds. How fast must they walk so that they each hear a frequency of 438 Hz from the other fork?
When the time is 0.5t, is the height of the object greater than 0.5h, equal to 0.5h, or less than 0.5h? Give reasons for your answers.
The second aircraft is at altitude 1000 m, horizontal distance 17.2 km, and 22.0° south of west. What is the distance between the two aircraft? (Place the x axis west, the y axis south, and the
Heat was applied and the temperature was back to 85 degrees Fahrenheit. Find the final weight, volume and pressure of the gas.
A car weighing 10 N on a hill which makes an angle of 20 degree with the horizontal. Find the components of car's weight parallel and perpendicular to the road?
If you have a 20 by 20 square opening and you need an equalaterial triangle to span the opening what are the smallest dimensions would you need?
A ripe mango hanging from a branch suddenly falls down to the ground. If the mango acquired a final velocity of 8 m/s when it hit the ground how high was the mango before it fell?
What is the rms current in an RC circuit if R= 5.20 KΩ , C= 1.50 uF, and the rms applied voltage is 120 V at 60.0 Hz. What is the phase angle between voltage and current?
Suppose you are stopped for a traffic light and a ambulance approaches you from behind with a speed of 18 m/s. the given o the ambulance produces sound with a frequency of 955 hz. the speed of sound