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In reality, the angular speed of a baggage carousel does not change. Therefore, what must be the external torque acting on the system if ten bags are dropped each minute?
In a college homecoming competition, eighteen students lift a sports car. While holding the car off the ground, each student exerts an upward force of 390 N. What is the mass of the car in kilograms
The tension in a wire clamped at both ends is doubled without appreciably changing its length. What is the ratio of the new to the old wave speed for transverse waves in this wire?
A seed shoots out from the pod with the speed of 3.0 m/s but with a direction of motion 30° below the horizontal. The seed pod is initially 1.0 m above the ground.
The average force exerted on him by the ground is +18000 N, where the upward direction is taken to be the positive direction. From what height did the student fall? Assume that the only force acting
With the same double slit, what momentum magnitude pB is necessary so that an angle of θB = 17.6 x 10-4 degrees locates the first-order bright fringes?
Stationary railroad whistle is sounded. An echo is heard 5.0 seconds later by the train's engineer. If the speed of sound is 343 m/s, how far away is the reflecting surface?"
An object of mass 3.8 kg has a kinetic energy equal to 430 J. Calculate the velocity of the object.
A 5.00 Lb box sliding with a speed of 14.0 ft/sec along a horizontal surface encounters a rough area of the surface and comes to a stop at 1.35 sec later. what is the deceleration of the box?
It absorbs a photon that raises it to the next-higher energy level. what is the energy of the photon and what is the photon's frequency?
if the period of a pendulum on another planet is four times its period measured on earth, what is the gravitational acceleration on the planet?
As part of a safety investigation, two 1200 kg cars traveling at 24 m/s are crashed into different barriers. Find the average forces exerted on (a) the car that hits a line of water barrels and tak
If the height of the water slide in the figure is h = 3.3 m and the person's initial speed at point A is 0.48 m/s, what is the new horizontal distance L between the base of the slide and the splash
Mr. Gewanter, whose mass is 60.0 kg, is doing a physics demonstration in the front of the classroom. a) How much gravitational force does he exert on 55.0-kg Martha in the front row, 1.50 m away? b
Which of the following will result in the greatest acceleration?
The block of mass 4M moves to the right with a speed of v1=1.58 m/s. What is the velocity of the block of mass M? Calculate the original elastic energy in the spring if M = 0.365 kg.
what is the minimum value for the hanging weight to the nearest tenth of a kilogram if L = 1.7 meters and the configuration is to remain stable"
An undersea research chamber is spherical with an external diameter of 5.40 m. The mass of the chamber, when occupied, is 70400 kg. It is anchored to the sea bottom by a cable. Calculate the followi
A 800·kg elevator is attached to a cable whose tension is 8100·N. What is the magnitude of the elevator's acceleration?
If the Hawaiian hot spot is a fixed hot spot, which of the following directions is closest to the direction that the Pacific Plate was apparently moving when the Emperor Seamount Chain formed?
A massive steel cable drags a 25.0 kg block across a horizontal, frictionless surface. A 90.0 N force applied to the cable causes the block to reach a speed of 4.50 m/s in 1.50 s. What is the differ
Leroy, who has a mass of 71 kg, is skateboarding at 6.5 m/s when he smacks into a brick wall and comes to a dead stop in 0.2 s.
A 1000 {rm kg} wrecking ball hangs from a 15 {rm m}-long cable. The ball is pulled back until the cable makes an angle of 25.0^circle with the vertical. By how much has the gravitational potential
Sam, whose mass is 80.0 kg, takes off down a 55.0 m high, 10.0^circ slope on his jet-powered skis. The skis have a thrust of 220 N. Sam's speed at the bottom is 40.0 {rm m/s}. What is the coefficie
An 80-cm-long wire is made by welding a 4.6 mm-diameter, 20-cm-long copper wire to a 4.6 mm-diameter, 60-cm-long iron wire. What is the resistance of the composite wire?