Abaseball pitcher in good form can throw a baseball that attains a speed of 97.0 mi/h in a distance of 1.30 m. assume that the ball starts from rest and its mass is 0.150 kg. (a) determine the magnitude of the average force exerted on the ball. (b) how would the pitcher need to alter the required force to reach the same speed if the mass of the ball is decreased. the pitcher would need to increase the force. the pitcher would need to decrease the force. the pitcher would not need to change the force.

If the ama of the inclined plane below is 2, calculate the ima and efficiency. ima = efficiency =

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 2 options: the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the cold balloon expands and rises. the warm balloon shrinks and sinks. the warm balloon expands and rises. the cold balloon shrinks and sinks.

Aturntable a is built into a stage for use in a theatrical production. it is observed during a rehearsal that a trunk b starts to slide on the turntable 10 s after the turntable begins to rotate. knowing that the trunk undergoes a constant tangential acceleration of 0.31 m/s2, determine the coefficient of static friction between the trunk and the turntable.