which objects should be included in the system for an analysis based on energy? select all that apply. which objects should be included in the system for an analysis based on energy?select all that apply. the earth the sled the ice the spring the barricade
a car travels on a road that, if viewed from the side, has a semicircular bump. when at the top of the bump, the occupants of the car feel as though they weigh half their normal weight. what is the speed of the car if the radius of the semicircle is 120 m?
a man pushes an 80-n crate a distance of 5.0 m upward along a frictionless slope that makes an angle of 30 with the horizontal. his force is parallel to the slope. if the speed of the crate decreases at a rate of 1.5 m/s^2, then the work done by the man is
4. what type of orbit was the satellite in that took these images? how do you know? 5. do you think these images were taken during the northern hemisphere spring or fall?
one kind of baseball pitching machine works by rotating a light and stiff rigid rod about a horizontal axis until the ball is moving toward the target. suppose a baseball is held from the axis of rotation and released at the major league pitching speed of .
a flatbed truck is carrying a heavy crate. the coefficient of static friction between the crate and the bed of the truck is 0.75. what is the maximum rate at which the driver can accelerate and still avoid having the crate slide across the bed of the truck?
when a fan is turned off, its angular speed decreases from 150 rpm to 50 rpm in 5.0 s. what is the magnitude of the average angular acceleration (in terms of rad/s2) of the fan?
if a resistance load of 80kg has a moment arm of 0.2m and our applied force moment arm is 0.5m how much force do we need to generate to balance the load?
a crate is pushed across the floor with a force of 200 n which causes an acceleration of 2.1 m/s2. if the coefficient of kinetic friction is 0.19, what is the mass of the crate?
a wrecking ball is suspended from a 5.0 m long cable that makes a 30o angle with the vertical. the ball is released and swings down. what is the ball's speed at the lowest point?
An object with a heat capacity of 3. 40×103j∘c absorbs 54. 0 kj of heat, beginning at −25. 0∘c. What will be the final temperature of the object?.
The majority of animals are ______________ and rely on heat exchange with the environment for regulation of body temperature.
A 1,100 kg car is traveling at 20 m/s as it begins going down a 40 m hill. What is its total mechanical energy?(1 point) A 651,200 J B 211,200 J C 431,200 J D 220,000 J
Three friends each do work to push an object across the room. Katie does 400 J of work while pushing her object across the room in 6 seconds. Alice does 300 J of work while pushing her object across the room in 7 seconds. Alyssa does 350 J of work while pushing her object across the room in 5 seconds. Which friend has the largest power output?
A single mechanical wave moves through two strings. In the first string, the wave has a speed of 260 m/s and a wavelength of 1.8m. In the second string, the wave has a speed of 25 m/s. Calculate the wavelength of the mechanical wave in the second string.
Calculate the rock's gravitational potential energyat 50 m, 20 m, 1 m, and 0 m hight. Please someone help!
