topic 6-7

ltem9 I Review | Constants Two billiard balls of equal mass undergo a perfectly elastic head-on collision. V PartA If one ball's initial speed was 2.50 m/s, and the other's was 4.50 m/s in the opposite direction, what will be their velocities after the collision? Enter your answers numerically separated by a comma. Enter positive value if the direction of the velocity is the same as the direction of the initial velocity of the first ball, and negative value if the direction of the velocity is opposite to the direction of the initial velocity of the first ball. m Muest Answer ork #6 (Chapters Item 5 5 of 15 Review | Constants A novice skier, starting from rest, slides down an icy frictionless 6.0 * incline whose vertical height is 105 m . Part A How fast is she going when she reaches the bottom? Express your answer to two significant figures and include the appropriate units. HA ? m V = 14.816 S Submit Previous Answers Request Answer X Incorrect; Try Again; 3 attempts remainingItems I Review | Constants A BOG-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 to 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. V PartA What was the speed sports car at impact? Express your answer to two significant figures and include the appropriate units. m Previous Answers Request Answer \" temView?assignmentProblemlD=185010323&attemptNo:1&offset=next . Item 7 7 of 15 > Review | Constants A 17-kg hammer strikes a nail at a velocity of 7.1 m/s and comes to rest in a time interval of 8.2 ms. Part A V What is the impulse given to the nail? Express your answer to two significant figures and include the appropriate units. FAt = 120- kg.m S Submit Previous Answers Correct Part B What is the average force acting on the nail? 176Item? A 17-kg hammer strikes a nail at a velocity of 7.1 m/s and comes to rest in a time interval of 8.2 ms . V Part A What is the impulse given to the nail? Express your answer to two significant figures and include the appropriate units. kg-m s 15At= 120 Previous Answers V Correct V Part B What is the average force acting on the nail? Express your answer to two significant figures and include the appropriate units. lmmo? Item 9 I Review | Constants Two billiard balls of equal mass undergo a perfectly elastic head-on collision. V PartA If one ball's initial speed was 2.50 m/s, and the other's was 4.50 m/s in the opposite direction, what will be their velocities after the collision? Enter your answers numerically separated by a comma. Enter positive value if the direction of the velocity is the same as the direction of the initial velocity of the first ball, and negative value if the direction of the velocity is apposite to the direction of the initial velocity of the first ball. m Fl_equest Answer Item 10 10 of 15 Review | Constants A constant friction force of 25 N acts on a 62-kg skier for 20 s on level snow. Part A What is the skier's change in velocity? Express your answer to two significant figures and include the appropriate units. 0 HA ? Av= Value Units Submit RecItem 11 Two billiard balls of equal mass move at right angles and meet at the origin of an my coordinate system. Ball A is moving upward along the y axis at \"A = 3.0 m/s , and ball B is moving to the right along the x axis with speed 113 = 5.9 m/s . After the collision, assumed elastic, ball B is moving along the positive y axis(gure 1). Figure 1 of 1 V PartA Item 11 11 of 15 Figure 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 Previous Answers Request Answer Provide Feedback \".m. \\ Item 14 I Review | Constants A baseball (m = 145g) traveling 36 m/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. Fen glove = 3 .2x 1 02 o The value should be entered as a single number or in scientific notation. No credit lost. Try again. Previous Answers R_equest Answer Item 15