According to Newton's first law of motion, an object at rest will stay at rest and an object in motion will stay in motion with constant velocity unless acted upon by an unbalanced force. This is also known as the law of: a) Inertia pen_spark b) Acceleration c) Gravity d) Momentum???.....
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- A bullet has a mass of 2.7 g and a muzzle velocity of 1150 ft/s. If fired horizontally, it can penetrate eight 1-inch pine boards before coming to a stop. Each pine board has a thickness 0.8 inches. What is the average stopping force exerted by the wood? a) 10953N b) 1018 N c) 279 N15) A rocket whose initial mass is 12,500 kg is in deep space and consumes fuel at a rate of 62.5 kg /s . The speed of the exhaust gases relative to the rocket engine is 2,500 m/s. What is the thrust ofthe engines in units of kilo-Newtons (kN)? a) 0.080 kN b) 156 kN c) 1.95 x 109 kN d )1.56 x 105 kN e) 12.5 kNConsider the following question: A car moving at 10 m/s crashes into a tree and stops in 0.26 s. Calculate the force the seatbelt exerts on a passenger in the car to bring him to a halt. The mass of the passenger is 70 kg. Would the answer to this question be different if the car with the 70-kg passenger had collided with a car that has a mass equal to and is traveling in the opposite direction and at the same speed? Explain your answer.
- Two blocks with different mass are attached to either end of a light rope that passes over a light, frictionless pulley that is suspended from the ceiling. The masses are released from rest, and the more massive one starts to descend. After this block has descended a distance 1.40 m , its speed is 3.00 m/s. If the total mass of the two blocks is 18.0 kg, what is the mass of the more massive block? Take free fall acceleration to be 9.80 m/s2.A person catches a ball with a mass of 145 g dropped from a height of 60.0 m above his glove. His hand stops the ball in 0.0100 s. What is the force exerted by his glove on the ball? Assume the ball slows down with constant acceleration.An Atwood’s machine is set up by suspending two blocks connected by a string of negligible mass over a pulley, as shown above. The blocks are initially held at rest and then released at time t0=0 s. The speed of the 3 kg block at time t1=2.0 s is most nearly: A) 2.0 m/s B) 4.0 m/s C) 7.0 m/s D) 10.0 m/s
- In a game of baseball, a 1.0-kg ball is pitched to Sarah at 20 m/s. She hits the ball back to the pitcher at the same speed. If her bat was in contact with the ball for 0.10 s, what is the magnitude of the average force the bat exerted? a) 40 N b) 400 N c) 200 N d) 800 NWhat is Newton's third law of motion? .Can someone help me please (A) It states that in the absence of outside forces, the total momentum of objects does not change (B). action and reaction (C) It states that if one object exerts a force on another object, then the second object exerts a force of equal strength in the opposite direction on the first object. (D) none of the above