A toboggan of mass 9.0 kg is moving horizontally at 24 km/h. As it passes under a tree, 13 kg of snow drop onto it. Find its subsequent speed. (km/h)

Flying Circus of Physics On August 10, 1972, a large meteorite skipped across the atmosphere above the western United States and western Canada, much like a stone skipped across water. The accompanying fireball was so bright that it could be seen in the daytime sky and was brighter than the usual meteorite trail. The meteorite's mass was about 3.7 × 106 kg; it's speed was about 14 km/s. Had it entered the atmosphere vertically, it would have hit Earth's surface with about the same speed. (a) Calculate the meteorite's loss of energy (as a positive number, in joules) that would have been associated with the vertical impact. (b) Express the energy as a multiple of the explosive energy of 1 megaton of TNT, which is 4.2 × 1015 J. (c) The energy associated with the atomic bomb explosion over Hiroshima was equivalent to 13 kilotons of TNT. To how many Hiroshima bombs would the meteorite impact have been equivalent? (a) Number (b) Number Units Units (c) Number Units

1) A baseball with a mass of 137 g is thrown horizontally with a speed of 40.6 m/s (91 mi/h) at a bat. The ball is in contact with the bat for 1.05 ms and then travels straight back at a speed of 45.4 m/s (102 mi/h). Determine the average force (in N) exerted on the ball by the bat. Neglect the weight of the ball (it is much smaller than the force of the bat) and choose the direction of the incoming ball to be positive.    2)A 4.50 gram bullet is fired from a rifle at a horizontal speed of 210 m/s. If the rifle has a weight of 25.0 N and is initially motionless, determine the recoil speed of the rifle.

An outlaw cuts loose a wagon with two boxes of gold, of total mass 300 kg, when the wagon is at rest 50 m up a 6.0° slope. The outlaw plans to have the wagon roll down the slope and across the level ground, and then fall into a canyon where his accomplices wait. But in a tree 40 m from the canyon’s cliff wait the Lone Ranger (mass 75.0 kg) and Tonto (mass 60.0 kg). They drop vertically into the wagon as it passes beneath them (Fig.). (a) If they require 5.0 s to grab the gold and jump out, will they make it before the wagon goes over the cliff? The wagon rolls with negligible friction. (b) When the two heroes drop into the wagon, is the kinetic energy of the system of heroes plus wagon conserved? If not, does it increase or decrease, and by how much?

A 15-g bullet traveling 399 m/s in a vertical direction buries itself in a 3 kg block of wood at rest directly above it.  As a result, the bullet/block combination moves vertically upward together. Determine the maximum height reached by the bullet/block combination.

tolerance is 3 sig figs

Shot put is a track and field event in which a heavy spherical ball (the "shot") is thrown (or "put", using the sport's terminology) as far as possible. A "shot" with mass of 4.3 kg is "put" into the air. Its initial speed is 9.5 m/s, directed at an angle 42 degrees above the horizontal. If the initial height of the ball was 176 cm when it was thrown, how high off the ground (in m) is the ball when it reaches the highest point in its trajectory?

Two forces, F :(-4.00î – 3.95ĵ) N and F, = (-3.95î – 4.95j) N, act on a particle of mass 1.90 kg that is initially at rest at 1 coordinates (+1.95 m, +4.05 m). (a) What are the components of the particle's velocity at t = 11.1 s? m/s (b) In what direction is the particle moving at t = 11.1 s? ° counterclockwise from the +x-axis (c) What displacement does the particle undergo during the first 11.1 s? (d) What are the coordinates of the particle at t = 11.1 s? X = m y =