topic 6

Item 1 Part A A 350 kg piano slides 2.6 m down a 28 . incline and is kept from accelerating by a man who is pushing back on it parallel to the incline (see the figure(Figure 1)). Ignore Determine the force exerted by the man. friction. Express your answer to two significant figures and include the appropriate units. HA FP = Value Units Submit Request Answer Part B Determine the work done on the piano by the man. Express your answer to two significant figures and include the appropriate units. HA FOE ? WP = Value Units Submit Request Answer Figure Review | Constants A 900-kg sports car collides into the rear end of a 2200-kg SUV stopped at a red light. The bumpers lock, the brakes are locked, and the two cars skid forward 2.4 m before stopping. The police officer, estimating the coefficient of kinetic friction between tires and road to be 0.80, calculates the speed of the sports car at impact. Part A What was the speed sports car at impact? Express your answer to two significant figures and include the appropriate units. LA ? U = Value Units Submit Request AnswerItem 7 6 0 O ? is moving along the positive y axis(gure 1). (9 = 0 clockwise from the +y-direction Muest Answer V PartB What are their two speeds? Express your answers using two significant figures. Enter your answers numerically separated by a comma. .Ammo? I I vA,vB m/s m Quest Answer Provide Feedback Figure 1 0H Next > IB +3? l'A / \\ \\A/ Item 12 I Review | Constants V PartA Calculate the force exerted on a rocket when the propelling gases are being expelled at a rate of 1200 kg/S with a speed of 4.4x104 m/s . Express your answer to two significant figures and include the appropriate units. Enter positive value if the force is opposite to the velocity of the propelling gases and negative value if the force is in the same direction as the velocity of the propelling gases. m m...\" Mm, Item 13 V PartA An object at rest is suddenly broken apart into fragments A and B by an explosion. The fragment A acquires six times the kinetic energy of the fragment 3- Express your answer using two signicant figures. What is the ratio of their masses? m Muest Answer Provide Feedback Item 14 A baseball (m = 145g) traveling 36 111/ s moves a fielder's glove backward 27 Cm when the ball is caught. V PartA What was the average force exerted by the ball on the glove? Express your answer to two significant figures and include the appropriate units. F011 glove = Value UnitS m MW Provide Feedback Item 15 A vertical spring (ignore its mass), whose spring constant is 850 N/m , is attached to a table and is compressed down by 0.160 m. Part A What upward speed can it give to a 0.360-kg ball when released? Express your answer to three significant figures and include the appropriate units. HA V = Value Units Submit Request Answer Part B How high above its original position (spring compressed) will the ball fly? Express your answer to three significant figures and include the appropriate units. HA y2 - y1 = Value Units Submit Request