if i am using a lever to do work, and my work output is 80 n and my work input is 160 n. what is my mechanical efficiency?
what would happen to the velocity of a river if an avalanche dumped rocky debris on its stream bed? group of answer choices
What is the concentration of a solution made by diluting 35 ml of 6. 0 m hcl to a final volume of 750 ml?.
What is the concentration of a solution made by diluting 15 ml of 6. 0 m hcl to a final volume of 750 ml?.
a person has a choice of sliding down three slides, which are shown below. all slides start at the same height above the ground. ignoring friction, for which slide will the final speed of the person at the bottom be the highest?
a rocket of mass 2x105 kg starts from rest at ground level and accelerates vertically at 4 m/s2. what is the instantaneous power of the engine when the speed is 50 m/s. ignore air resistance and changes in the mass of the rocket
speedy sue, driving at 33.0 m/s, enters a one-lane tunnel. she then observes a slow-moving van 165 m ahead traveling with velocity 5.40 m/s. sue applies her brakes but can accelerate only at -2.00 m/s2 because the road is wet. will there be a collision?
if the coefficient of kinetic friction between a 22-kg crate and the floor is 0.30, what horizontal force is required to move the crate at a steady speed across the floor? what horizontal force is required if the coefficient of kinetic friction is zero?
the speed of sound in air is 340 m/s. the speed of light is 3.0 x 10 8 m/s. you hear the sound of a distance cannon 2.0 s after seeing a flash of light from it. how far you from the cannon?
i took my football with 5.4 liters of air at 1.9 atm, and went deep sea diving with it. at 40 meters, the intense water pressure crushed my ball, and now there are only 2.16 liters in the ball. what is the pressure at my new depth
a flywheel with a diameter of 0.989 m is rotating at an angular speed of 192 rev/min. what is the angular speed of the flywheel in radians per second. what is the linear speed
a 225g hockey puck slides to a stop along the ice in 23m. what was the original speed of the puck if the coefficient of kinetic friction between the ice and the puck was 0.16?
a bomb, initially at rest, explodes into several pieces. (a) is linear momentum of the system conserved? (b) is kinetic energy of the system conserved?
4. if charge q is stored on a capacitor, what is the magnitude of positive charges stored on one plate? what is the magnitude of negative charges stored on the opposite plate?
a 75-kg swimmer dives horizontally off a 200-kg raft initially at rest. if the diver's speed immediately after leaving the raft is 2 m/s, what is the corresponding raft speed?
an object tall is from a concave lens. the resulting image is half as large as the object. what is the focal length of the lens
