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- An arrow, starting from rest, leaves the bow with a speed of 21.0 m/s. If the average force exerted on the arrow by the bow were tripled, all else remaining the same, with what speed would the arrow leave the bow?A person slaps her leg with her hand, bringing her hand to rest in 260 ms from an initial speed of 4.15 m/s.What is the magnitude of the average force exerted on the leg, in newtons, taking the effective mass of the hand and forearm to be 1.55 kg? f ave =A bullet (m = 0.027 kg) is fired with a speed of 92.00 m/s and hits a block (M = 2.20 kg) supported by two light strings, stopping quickly. Find the height h to which the block rises. Find the angle through which the block rises, if the strings are 0.26 m long.
- A net horizontal force of 5000N is applied to a stalled car whose mass is 1500kg. What will be the car's speed after 10s?A bullet (m = 0.0250 kg) is fired with a speed of 95.00 m/s and hits a block (M = 2.10 kg) supported by two light strings as shown, stopping quickly. Find the height to which the block rises. Find the angle (in degrees) through which the block rises, if the strings are 0.270 m in length.Ahockey puck of mass 322 g is siding due east on a fictionless table with a speed of 150 ms Suddenlys constare force of magnitude 4.03 N and deacted due north is applied to the puck f 2.55s Find the magnitude of the moment | 4pm at the end of the 255-s interval (Express your answer to 2 decimal places, with no unit
- An advertisement claims that a particular automobile can “stop on a dime.” What net force would be necessary to stop a 90 kg automobile traveling initially at 55.0 km/h in a distance equal to the diameter of a dime, 2.8 cm?A soccer ball of mass 0.4 kg, initially at rest, acquires a speed of 5 m/s immediately after being kicked by a force of 20 N. How long did this force act on the ball?Repeat the preceding problem, but including a drag force due to air of fdrag=bv .
- Check Your Understanding How does your weight at the top of a tall building compare with that on the first floor? Do you think engineers need to take into account the change in the value of g when designing structural support for a very tall building?When catching a fast-moving baseball, why would the player want to extend his arm far out ahead of himself when catching the ball?A nucleus that captures a stray neutron must bring the neutronto a stop within the diameter of the nucleus by means of thestrong force. That force, which “glues” the nucleus together, is approximatelyzero outside the nucleus. Suppose that a stray neutronwith an initial speed of 1.4 * 107 m/s is just barely captured by anucleus with diameter d = 1.0 * 10-14 m. Assuming the strongforce on the neutron is constant, find the magnitude of that force.The neutron’s mass is 1.67 * 10-27 kg.