an arrow is shot horizontally from a height of 4.9m above the ground. the initial speed of the arrow is 45 m/s. neglecting friction: a) how long will it take the arrow to hit the ground? b. how far does the arrow go?
two gliders collide on a frictionless air track that is aligned along the xx axis. glider aa has an initial velocity v0v0 and glider bb is initially at rest. after they collide, aa has a velocity 12v012v0 and bb has a velocity 92v092v0 . find the ratio of the gliders' masses, mambmamb .
a particle of charge -1.2410-8 c has an instantaneous velocity, . what is the force exerted on this particle by a magnetic field, ?
a computer is reading data from a rotating cd-rom. at a point that is 0.030 m from the center of the disc, the centripetal acceleration is 120 m/s2. what is the centripetal acceleration at a point that is 0.050 m from the center of the disc?
a kilogram object suspended from the end of a vertically hanging spring stretches the spring centimeters. at time , the resulting mass-spring system is disturbed from its rest state by the force . the force is expressed in newtons and is positive in the downward direction, and time is measured in seconds. determine the spring constant . newtons / meter
jupiter's moon io is thought to be the volcanically active world in our solar system. what is the inferred source of heat? group of answer choices io is close to jupiter, and the strong tidal forces on planet produce frictional heating of the planet. it is a mystery; it should be very cold because it is the same size as the moon but far from the sun. io has a strong magnetic field as does jupiter, so as io moves through jupiter's magnetic field, large electrical currents are generated, which heat the planet. very high abundances of radioactive elements have been detected on the planet.
if the intensity of a (visible) light beam is increased, how does that light change to our eyes (and instruments)?'
in 2013, a small stony asteroid collided with the earth above the russian city of chelyabinsk. what was the result?
The most active galactic nuclei are usually found at large distances from us; relatively few nearby galaxies have active galactic nuclei. What does this imply?.
a paraxial ray group of answer choices moves in a parabolic path. is a ray that moves nearly parallel to the optical axis. is a ray that moves exactly parallel to the optical axis. is a ray that has been reflected from parabolic mirror.
if you are in a car that is struck from behind, you can receive a serious neck injury called whiplash. using newton's laws of motion, explain what happens to cause the injury. how does a headrest reduce whiplash?
the drag force due to air resistance on a soccer ball traveling through the air at 20 ~\text{m/s}20 m/s is 2.3 ~\text{n}2.3 n. what is the drag force on that same soccer ball when it is moving through the air at 28.2 ~\text{m/s}28.2 m/s
a proton, initially at rest, moved from a place where the electric potential is 500 v to a place where the electric potential is 0 v. what is the proton's initial kinetic energy, initial electric potential energy
a small block of mass m slides without friction around the loop-the-loop apparatus shown below. (a) if the block starts from rest at a, what is its speed at b? (b) what is the force of the track on the block at b?
a truck driver is attempting to deliver some furniture. first, he travels 8 km east, and then he turns around and travels 3 km west. finally, he turns again and travels 12 km east to his destination. what distance has the driver traveled?
a ball launched from ground level lands 2.85 s later on a level field 38 m away from the launch point. find the magnitude of the initial velocity vector and the angle it is above the horizontal. (ignore any effects due to air resistance.)
