If an airplane is running low on fuel, the pilot may decide to dump unneeded weight. As the airplane gets lighter, the engines need less fuel to generate the
same amount of acceleration for flight. The pilot has taken advantage of
Newton's law of motion.

Atransverse wave is traveling on a string stretched along the horizontal x-axis. the equation for the vertical displacement y of the string is given by y = (1.8 x 10-3)cos[π(13x - 60t)], where all quantities are in si units. what is the maximum speed of a particle of the string

Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.

Which phenomenon is caused by the magnetic field of the earth? a. magnets sticking to the steel door of a refrigerator b. one end of a magnetized needle pointing to the north c. iron becoming magnetized when rubbed with a strong magnet d. some magnets losing their magnetism when struck with a hammerlisa is standing outside her school. if an ambulance is approaching the school at fifty miles per hour with its siren on, how will the way lisa hears the sound compare to the way the driver of the ambulance hears the sound? a. lisa will hear the sound at a higher pitch than the driver. b. the driver will hear the sound after lisa hears the sound. c. lisa will hear the sound at the same wavelength as the driver. d. the driver will hear the sound at a higher frequency than lisa.what is the difference between an electromagnet and a bar magnet? a. a bar magnet's magnetic field is a perfect circle. b. a bar magnet weighs less than an electromagnet. c. an electromagnet's magnetic field can be switched on and off. d. an electromagnet has only one pole while a bar magnet has two.which statement accurately describes gravitational force? a. it is weak and long-ranged. b. it is strong and long-ranged. c. it is weak and short-ranged. d. it is strong and short-ranged.which of the following statements about magnets and magnetism is true? a. the north pole of a magnet is attracted to the south pole of another magnet. b. the north pole of a magnet can magnetize iron but the south pole cannot. c. the poles of a magnet result from the magnetic domains pointing in different directions. d. the poles of a magnet have weaker magnetic forces than the center of a magnet.the moving company loaded a crate that weighed 1800 n into a truck that was 1 meter off of the ground. they used a force of 600 n to push it up a ramp that had a slope of 4 meters. what was the efficiency of the moving company's ramp? a. 57% b. 68% c. 75% d. 86%which statement best explains why machines are inefficient? a. energy transfer in compound machines gives off electrical waste. b. during energy transfer in machines, some energy is always lost as heat. c. balanced forces in moving machines produce waste in the form of steam. d. when work is done by machines, gravity always causes a decrease in force.