Lab 7

Which of the following statement is not correct? O a. A bus going down the valley may have variable acceleration. O b. A lift going down in a gold mine canrnot have constant acceleration in the entire Journey. O c. In a cricket match, the ball does not move with constant acceleration. O d. A body falling freely under the force of gravity is an exarmple of motion under variable acceleration. Question 12 Not vet

4. How does an air bag protect a driver during an accident? It reduces the kinetic energy loss of the driver. I It reduces the momentum change of the driver. It increases the momentum change of the driver. It shortens the stopping time of the driver and increases the force applied during the accident. It lengthens the stopping time of the driver and reduces the force applied during the accident.

Which of the following statement is not correct? O a. A lift going down in a gold mine cannot have constant acceleration in the entire Journey. O b. A bus going down the valley may have variable acceleration. O c. In a cricket match, the ball does not move with constant acceleration. O d. A body falling freely under the force of gravity is an example of motion under variable acceleration.

What occurs during acceleration, which shifts the weight of the car from the front to the back

The pump is used to increase the kinetic energy of the liquid Select one: True O False

When acceleration can be zero?

What is the maximum distance up the ramp attained by the block?       smaxsmax =         What is the maximum velocity attained by the block as it moves up the ramp?       vmaxvmax =

Which of the following choices best represents force?   A. A push or pull always causing motion   B. A push or pull always causing acceleration   C. A push or pull acting without another object   D. A push or pull acting on an object

Which allows you to throw the ball the farthest?  Why? which out of the three only pick one  wrist, shoulder, elbow elbow, shoulder, wrist shoulder, elbow, wrist

Answer clearly

A hydraulic press must be used to press-fit two components together in an assembly process. The system must generate at least 975 lb of force to perform the press fit. The piston at the input cylinder is pushed with a force of 250 lb and has an area of 30 in.2. The output can use up to 15 cylinders that are each 30 in.2. How much mechanical advantage is required to gain the necessary force ?

2. Granny Shots The last player in the NBA to use an underhand foul shot (a "granny" shot) was Hall of Fame forward Rick Barry, who retired in 1980. Barry believes that current NBA players could increase their free-throw percentage if they were to use an underhand shot. Since underhand shots are released from a lower position, the angle of the shot must be increased. If a player shoots an underhand foul shot, releasing the ball at a 70-degree angle from a position 3.5 feet above the floor, then the path of the ball can be modeled by the function h(x) = -- 136x2 + 2.7x + 3.5, where h is the height of the ball above the floor,x is the forward distance of the ball in front of the foul line, and v is the initial velocity with which the ball is shot in feet per second. (a) The center of the hoop is 10 feet above the floor and 15 feet in front of the foul line. Determine the initial velocity with which the ball must be shot in order for the ball to go through the hoop. (b) Write the function…

.Q21 The forces do not cause rotation