a 50-n force is applied to a crate on a horizontal rough floor, causing it to move horizontally. if the coefficient of kinetic friction is 0.50, in what direction should the force be applied to obtain the greatest acceleration?
sarah attempts to do the popular physics trick of swinging a pail of water around in a vertical circle fast enough so the water doesn't spill out when the pail is upside down. if her arm is 0.455 meters long, what is the minimum speed with which she can swing the pail so the water does not spill out at the top of the path?
an observer stands 800 ft away from a launch pad to observe a rocket launch. the rocket blasts off and maintains a velocity of 500 ft/sec. assume the scenario can be modeled as a right triangle. how fast is the angle of elevation (in radians/sec) from the observer to rocket changing when the rocket is 1500 ft off the ground?
a vertical wire carries a current vertically upward in a region where the magnetic field vector points north. what is the direction of the magnetic force on this current due to the field? a) downward b) toward the north c) toward the south d) toward the east e) toward the west
a system of four buckets forms a square as shown in the figure. initially, the buckets have different masses (it is not known how these masses are related). a student begins to add water gradually to the bucket located at the origin. as a result, what happens to the coordinates of the center of mass of the system of buckets?
a 45.0-kg girl is standing on a 150.-kg plank. the plank, origi- nally at rest, is free to slide on a frozen lake, which is a flat, fric- tionless surface. the girl begins to walk along the plank at a constant velocity of 1.50 m/s to the right relative to the plank. (a) what is her velocity relative to the surface of the ice?
the only force acting on a 4.4 kg canister that is moving in an xy plane has a magnitude of 5.1 n. the canister initially has a velocity of 2.6 m/s in the positive x direction, and some time later has a velocity of 6.9 m/s in the positive y direction. how much work is done on the canister by the 5.1 n force during this time?
choose the appropriate wavelengths of light in nanometers. note that answers may be used multiple times or not at all. what wavelength of light is too long to be visible to the human eye? what wavelength of light is absorbed by the atmosphere and doesn't reach the earth's surface? what is the shortest wavelength of uvc light?
are the objects described here in static equilibrium, dynamic equilibrium, or not in equilibrium at all?
if the wavelength of a 220 hz sound is in freshwater is 3.3 m, what is the speed of sound in freshwater?
what is the direction of alpha with arrow if the magnitude of the angular velocity is decreasing in time?
in a conductor, what is the material through which it is difficult to conduct an electric current called?
an fm radio station of frequency 103.1 mhz puts out a signal of 49,000 w. how many photons/s are emitted?
A 10,000-kg rocket blasts off from earth with a uniform upward acceleration of 2. 00 m/s2 and feels no air resistance. The upward thrust force its engines must provide during this acceleration is closest to.
if the fixed carriage and the sliding carriage are at a radius of 15 cm and you add a total mass of 300 g to the sliding carriage, what total mass in grams should you have in the fixed carriage?
in what direction is the torque applied? use the cartesian xyz-space, in which the bolt is aligned with the z-axis and positive z is in the upward direction.
