A 2210 kg car traveling at 10.1 m/s collides with a 2680 kg car that is initally at rest at a stoplight. The cars stick together and move 2.10 m before friction causes them to stop. Determine the coefficient of kinetic friction between the cars and the road, assuming that the negative acceleration is constant and all wheels on both cars lock at the time of impact.

The nucleus of 8Be, which consists of 4 protons and 4 neutrons, is very unstable and spontaneously breaks into two alpha particles (helium nuclei, each consisting of 2 protons and 2 neutrons). (a) What is the force between the two alpha particles when they are 5.00 x 10-15 m apart, and (b) what is the initial magnitude of the acceleration of the alpha particles due to this force? Note that the mass of an alpha particle is 4.0026 u.

9:58 PM Sun Feb 27 blackboard.albany.edu A 令74% O exactly as strong as the force of gravity on a 3-kg mass QUESTION 3 1 points A rocket is launched vertically from the Earth, and the thrust (pushing force) from the engines is directed upward, and has a magnitude of 5.00 x 106 N. The mass of the rocket is initially 2.00 x 10° kg. What is the initial acceleration of the rocket, assuming you can neglect air resistance? 25.0 m/s? 15.2 m/s2 O 7.6 m/s? 50.0 m/s2 1 points QUESTION 4 Click Save and Submit to save and submit. Click Save All Answers to save all answers. Sa Save All Answers

A small sphere of mass 2.50 g is released from rest in a large vessel filled with oil, where it experiences a resistive force proportional to its speed. The sphere reaches a terminal speed of 4.00 cm/s. Determine the time constant, and the time at which the sphere reaches 75.0% of its terminal speed.

You are working as a letter sorter in the Post Office. Postal regulations require that employees’ footwear must have a minimum coefficient of static friction of 0.5 on a specified tile surface. You are wearing athletic shoes for which you do not know the coefficient of static friction. In order to determine the coefficient, you imagine that there is an emergency and start running across the room. You have a co-worker time you, and find that you can begin at rest and move 4.23 m in 1.20 s. If you try to move faster than this, your feet slip. Assuming your acceleration is constant, does your footwear qualify for the postal regulation?

On 24 November 2021 the DART (Double Asteroid Redirection Test) spacecraft was launched. Its mission is to assess the ability of an impact to deflect the path of an asteroid. DART was launched on a Falcon 9 rocket. At launch a Falcon rocket has a mass of 555 000 kg and generates a force of 7.6 x 106 N. A. Neglecting the effect of gravity, what is the initial acceleration of the rocket? Give your answer to an appropriate number of significant figures. B. Assuming that the initial acceleration remains constant, how fast will the rocket be moving after 2 seconds? C. In practice, as the rocket burns fuel, its mass decreases. Assuming the thrust remains the same, how would your answer to part (ii) change? Would the speed after 2 seconds be lower, the same or higher?

The objective of curling, an Olympic discipline, is to throw stones at houses. The stone is a 18 kg block of granite that slides on the carefully prepared ice with a very low coefficient of kinetic friction, μk = 0.0178. With a curling broom the players can increase the friction to get as close as possible to the house, the target pattern embedded in the ice. Frequently an oncoming stone will bump a stone from a previous throw by the competing team. A stone reaches the house with a velocity of 1.2 m/s after traveling the 38 m length of the curling sheet. How fast the stone was going when it was released? The stone did not hit any other stones.

A dog and a sledge are on the frictionless ice of a frozen lake, 12.6 m apart but connected by a rope of negligible mass. The dog exerts a certain horizontal force (N) on the rope. If magnitudes of the sledge and the dog accelerations are o.7 m/s² and o.1 m/s², respectively. How far from the dog's initial position (m) do they meet?

A block with a carpeted underside (mass of .122 kg) is pulled by a wheeled cart (mass of .453 kg) attached by a piece of cordage down a ramp with an angle measured to be 3.9 degrees. The block and cart travel a distance of .7535 meters in 4.61 seconds. If the block and cart move together simultaneously, determine the acceleration (acceleration is constant) and then determine the static coefficient and kinetic coefficient. 122 kg 453 kg 3.9°(

Two blocks are joined by an inextensible cable as shown. If the system is released from rest, determine the velocity of block A after it has moved 2 m. Assume that the coefficient of kinetic friction between block A and the plane is 0.25 and that the pulley is weightdess and frictionless. 200 kg ㄱ 300 kg A B