Suppose that a bullet is fired from a rifle in outer space where there are no appreciable forces due to gravity or air resistance acting on the bullet. Which is the correct situation for the bullet after it is fired if it does not hit anything? Multiple Choice the bullet will slow down as it moves the bullet will speed up as it moves the bullet will remain at the same speed

À sprinter accelerates at the beginning of a 100-meter race and then tries to maintain a maximum speed throughout the rest of the race. Which of the following is correct once the sprinter reaches her maximum velocity assuming she is running in a straight line? Multiple Choice she no longer needs to push on the ground to run forward the net force on her equals zero the air resistance force on her equals zero

For a certain interval of time, an object is acted on by a constant non-zero force. Which of the following statements is true for this interval of time ? ( select all that apply)  the objects velocity changes  the object is accelerating  the objects velocity can only increase  the object is at rest  the object is moving with constant velo

Two people each have a mass of 125 KG they are both in an elevator that has a massive 200 KG when the elevator begins to move the people in the elevator have an upward acceleration of 1.5m/s^2 what is the net force The X on the elevator as it accelerates upwards at 1.50 m/s^2?

Seat belts and air bags save lives by reducing the forces exerted on the driver and passengers in an automobile collision. Cars are designed with a "crumple zone" in the front of the car. In the event of an impact, the passenger compartment decelerates over a distance of about 1 m as the front of the car crumples. An occupant restrained by seat belts and air bags decelerates with the car. By contrast, an unrestrained occupant keeps moving forward with no loss of speed (Newton's first law!) until hitting the dashboard or windshield. These are unyielding surfaces, and the unfortunate occupant then decelerates over a distance of only about 5 mm. Part A A 65 kg person is in a head-on collision. The car's speed at impact is 13 m/s. Estimate the net force on the person if he or she is wearing a seat belt and if the air bag deploys. Express your answer to two significant figures and include the appropriate units. Fnet = 7293 Submit CHμA Part B X Incorrect; Try Again Fnet = Previous Answers…

Construction workers are building a new skyscraper in a major city. A crane operator is using a crane to lift a heavy box of supplies (with a mass of 664 kg) to the top of the building when the cord suddenly snaps! The box of supplies free-falls to the ground from a height of 142 m.  How many seconds does it take for the supplies to crash into the ground below? _____s

54. Objects of masses m, = 4.00 kg and m, = 9.00 kg are connected by a light string that passes over a fric- tionless pulley as in Figure P4.54. The object m, is held m at rest on the floor, and m, rests on a fixed incline of 0 = 40.0°. The objects are released from rest, and m, slides 1.00 m down the incline in 4.00 s. Determine (a) the acceleration of each object, (b) the tension in the string, and (c) the coefficient of kinetic friction between m, and the Figure P4.54 incline.