I don't understand how a shovel is a 3rd class lever. isn't the load at the bottom? effort at the top? a fulcrum at the middle??? wouldn't that make it a first class lever? or am i just wrong?
Students are completing an investigation observing different methods of heat transfer. which of these would best demonstrate a heat transfer through conduction?
Lance armstrong starts 150 meters north of paris and is 11,500 meters north of the city after 30.0 minutes. determine his average velocity in meters per second.
A 4kg (mass) block that has a force of 5n applied from the left and a force of 10n applied from the right. solve for force, direction and acceleration.
A girl coasts down a hill on a sled, reaching a level surface at the bottom with a speed of 6 m/s. the coefficient of kinetic friction between the runners and snow is 0.04, and the girl and the sled together weigh 733 n. the acceleration of gravity is 9.8 meters per second squared. how far does the sled travel on the level surface before coming to rest?
Rodneys mass is 84kg and he is standing on a bathroom cscale in an elevator starting from rest, the elevator accelerates upward at 2.25 m/s^2 for 3.01 and then continuetes at a constnat speed. is the sacle reading duriong accleration gratin than, equal to, or less than the scale reading when the elevator is at rest\
In schachter and singer's classic study, participants who received epinephrine and were in the company of the "angry" research confederate interpreted their physiological arousal as __________, whereas those who were exposed to the "happy" confederate interpreted their arousal as __________.
The velocity as a function of time for a car on an amusement park ride is given as v= at^2 +bt, with constants a = 2.0 m/s^3 and b = 1.0m/s^2. if the car starts at the origin, what is its position at t = 3.0s.
A block mass m and a block of mass 2m are resting on a frictionless surface. each experiences a force of magnitude f in opposite horizontal directions. write an equation for the acceleration of each block.
A basketball is thrown horizontally with an initial speed of 3 m/s. a straight line drawn from the release point to the landing point makes an angle of 30.0 degrees with the horizontal. what was the release height?
Light is incident upon the surface of the water in a level, flat-bottomed glass dish(see fifure, emailed). at what angle does the light emerge from the bottom of the dish?
when a constant force is applied to an object the acceleration of the object varies inversely with its mass. when a certain constant force acts upon an object with mass 4kg, the acceleration of the object is 17m/s^2. when the same force acts upon another object, its acceleration is 2m/s^2. what is the mass of this object?
Excitation of vibrational motion of molecules is associated with which region of the electromagnetic spectrum?.
A uniform horizontal beam 8 m long is attached by a frictionless pivot to a wall. A cable making an angle of 37o, attached to the beam 5 m from the pivot point, supports the beam, which has a mass of 600 kg. The breaking point of the cable is 8000 n. A man of mass 95 kg walks out along the beam. How far can he walk before the cable breaks?.
. a 500 g cart is released from rest on a horizontal track and travels 75.0 cm in 1.75 seconds while experiencing an average, horizontal applied force of 0.5 n. what is the magnitude of the force of friction between the cart and the track?
