A bullet is accelerated down the barrel of a gun by hot gases produced in the combustion of gun powder. What is the average force (in N) exerted on a 0.0500 kg bullet to accelerate it to a speed of 500 m/s in a time of 1.90 ms (milliseconds)? (Enter the magnitude.) N

A 47 kg skater is standing still in front of a wall. By pushing against the wall she propels herself backwards with a velocity of -1.1 m/s. Her hands are in contact with the wall for 1 seconds. Ignoring friction and wind resistance, find the average force she exerts on the wall? Faverage

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A baseball is thrown vertically upward and feels no air resistance. It reaches a maximum height and turns back downwards. As it is moving downwards O its gravitational potential energy is not conserved, buts its momentum is conserved. O both its momentum and its kinetic energy are conserved. O its momentum is not conserved, but its mechanical energy is conserved. O its kinetic energy is conserved, but its momentum is not conserved. O both its momentum and its mechanical energy are conserved.

2.3. A train car is sitting on a level track when a second car moves in. The second car hits the first, their hitches engage, and they move together. Both cars have equal masses of about 120 000 kg, and the second car initially has a velocity of 1.5 m/s. (a) Draw a diagram that illustrates the situation and include an arrow representing the velocity vector of the second car and a separate arrow representing ĉ, the unit vector for the coordinate system along the tracks. (b) Write vector expressions for both the velocity and momentum of the second car using at least two forms of vector notation that have been covered in class. (c) Just before the collision, what is the velocity of the center of mass of the system that includes both cars? Again, express this as a vector. (d) Just before the collision, what is the total kinetic energy of the system that includes both cars?

A rocket with a mass of 2.70x106 kg exerts a vertical force of 3.40×107 N on the gases it expels. ▼ Part A Determine the acceleration of the rocket. Assume g remains constant, and ignore the mass of gas expelled (not realistic). Express your answer using two significant figures. VE ΑΣΦ Submit Dart R Request Answer ? m/s²

g Anderson Video - Work Done by a Spring A block of mass 0.2 kg is launched by a spring k₁= 2.0 N/m as shown below. The block moves along a frictionless horizontal table and pushes another spring, k₂= 2.3 N/m, to the maximum deflection z. If the initial deflection of the spring k, is 0.050 m, what is the maximum deflection of spring k₂? Consider that the masses of the springs are negligible. Express your answer with the appropriate units. T= μA Value ▬▬ Units ? k₁ T P Pearson 4 of 14 k2 m > ▸

k A 13.00 kg particle starts from the origin at time zero. Its velocity as a function of time is given by = 10t² + 1tj where is in meters per second and t is in seconds. (Use the following as necessary: t.) V (a) Find its position as a function of time. ŕ= esc 10/³1 + ²/2 2²; 3 (b) Describe its motion qualitatively. The particle starts from rest at the origin, starts moving in the y direction, and gains speed faster and faster while turning to move more and more nearly parallel to the x axis. Score: 0.06 out of 0.06 Comment: (c) Find its acceleration as a function of time. a = 20ti + lj m/s² (d) Find the net force exerted on the particle as a function of time. F= T= (e) Find the net torque about the origin exerted on the particle as a function of time. N m X X (f) Find the angular momentum of the particle as a function of time. Ľ Need Help? Read It F1 N x (g) Find the kinetic energy of the particle as a function of time. K= x kg m²/s X (h) Find the power injected into the particle as a…

A world-class sprinter running a 100 m dash was clocked at 5.4 m/s 1.0 s after starting running and at 9.8 m/s 1.5 s later. Part A Determine the ratio of his output powers in these time intervals. Po to 1 P1 to 2.5 15 ΑΣΦ ?