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- A 57.0-g tennis ball is traveling straight at a player at 21.0 m/s. The player volleys the ball straight back at 25.0 m/s. If the ball remains in contact with the racket for 0.060 s, what average force acts on the ball? (a) 22.6 N (b) 32.5 N (c) 43.7 N (d) 72.1 N (e) 102 NJuliet drops a 0.25 kg grapefruit from the 3rd-floor balcony (10 m high), into Romeo's waiting hands (1 m high). b) what is the grapefruit's weight? +2.45 N (1) O -2.45 N (Į) O 9 m O 10 m O 0.25 kg O 2.45 N O 2.25 kg-m ()ud of 49. Add text (d) Draw Highlight ma²0² M 1 (c) — ma Q // (m (m₁ −m₂) x² +m₁gx+m₂g (l-x-лR) ma² cos² 00² Erase A particle of mass 'm' moves in horizontal plane along the curve s = a0 as shown in figure, where is angle made by tangent to the curve with x- axis and s is the distance coverved along the curve. Lagrangian of particle is 1 X # 1 (b) ma-sin°Đô (d) ma² sin² 00² P 2 ENG IN 40 0 ●● 22:27 22-07-2022 X :
- A loaded gun is dropped on a frozen lake. The gun fires, with the bullet going horizontally in one direction and the gun sliding on the ice in the other direction. The bullet's mass is 0.04 kg, and its speed is 275 m/s. If the gun's mass is 2.5 kg, what is its speed (in m/s)? m/sThe linear mass density of a straight rod of length L is given by 2 = a +x (kg/m). Here x is the distance measured from A. The center of mass of the rod is xm = L (m) away from the A end of the rod. What is the relationship between a and b? A x = 0 x = L B) a = b C) a = b D) a = ¿b E) a =b A) a = 2bCHAPTER 11 Most geologists believe that the dinosaurs became extinct 65 million years ago when a large comet or asteroid struck the earth, throwing up so much dust that the sun was blocked out for a period of many months. Suppose an asteroid with a diameter of 2.0 km and a mass of 1.0 * 10¹3 kg hits the earth (6.0 * 1024 kg) with an impact speed of 4.0 * 10 m/s. a. What is the earth's recoil speed after such a collision? (Use a reference frame in which the earth was initially at rest.) b. What percentage is this of the earth's speed around the sun? The earth orbits the sun at a distance of 1.5 * 10¹¹ m.
- A girl, having a mass of 15 kg, sits motionless relative to the surface of a horizontal platform at a distance of 5 m from the platform's center. If the girl speed is 2 m/s. What is the normal force that affects the girl?A thin rod of length L = 3.00 m with variable mass density (x) = 3.00x² kg/m lies on the x-axis with one end at the origin. Where on the X-axis is the center of mass of this rod? {note this is a variable mass density} O 2.50 m O 1.50 m O 2.25 m O 2.70 m O 1.88 m 279A 730 N student stands in the middle of a frozen pond having a radius 5.0 m. She is unable to get to the other side due to a lack of friction between her shoes and the ice. To overcome this difficulty, she throws her 2.6 kg physics textbook horizontally toward the north shore at a speed of 5.0 m/s. How long does it take her to reach the south shore?
- A 0.30 kg ball moving at 50 m/s strikes a stationary 3.0 kg box. The ball sticks to the box and the ball-box combination moves into a region where the coefficient of kinetic friction between the box and the surface is 0.60. What is the distance traveled by the ball-box system before coming to a complete stop? O 2.0 m O 1.1 m O 1.8 m O 1.5 m O 2.1 m Save for Later Submit AnswerCalculate the magnitude of the linear momentum for the following cases. A. A proton with mass 1.67 x 10^-27 kg moving with a speed of 4.80 x 10^6 m/s. D. the Earth (mass =5.98 x 10^24 kg) moving with an orbital speed equal to 2.98 x 10^4 m/s.00 h x1 X2 18.7m 11.1m m Mid-Air Explosion A drone is flying horizontally at a speed of v¿ when a battery malfunction causes it to explode into 2 pieces. The pieces fall to Earth from a height of h due to gravity (ignore air resistance). Piece #1 has a mass of 1.00kg and lands a horizontal distance of x1 from the explosion spot. Piece #2 has a mass of 2.00kg and lands a horizontal distance of x2 from the explosion spot. 9 Vi 8.52 m S Type your answer... 1 CM 2 10 DI h x1 X2 m 10.7m 18.1m Vi 8.44m S Type your answer...