Question

Please answer all but if not PLEASE answer number 9

IL IR & urve so that its centripetal acceleration is 5 m/s. What is the radius of the curve? A) 80 m B)8 m 2I the work done on an object is negative, C)4 m D) 320 mm The speed of the object decreases no change in the speed B) the speed of the object increases D) depends on the mass of the object ghter jet (m=1000kg) is launched from, an aircraft carrier with the aid of its own engines. The thrwstofunnama is 2.3xI0 N. In being launched from rest it moves through a distance of 87 m. What is the final velocity before take-off? A) 2x10' m/s B) 9.8 m/s C) 200 m/s 4The brakes of a car cause D) 283 m/s e it to slow down by applying a retarding force of 45 N to the car over a distance of 250 m . 113750N What is the work done by this force on the car? A) 11250N B ) C) 13750N D)-11250 N ger of a pinball machine. Because of a centripetal force of 0.028 N, the ball follows a circular are whose radius is 0.25 m. What is the speed of the ball? 6The principle of conservation of mechanical energy states: B) 0.68m/s C) 35m/s D) 091m/s A) The total kinetic energy of an object is always constant. B) The sum of kinetic and potential energy of an object is constant C) The change in potential energy is equal to the work performed on an object. D) The total potential energy of an object is always constant. A basketball (m-0.5kg) falls from an initial height of 15 m to a final height of 5 m. The ball is initially at rest. Calculate the speed of the basketball at the final height. A) 14 m/s A bob sled is driving at 36m/s. The bob sled enters a banked (frictionless) curve with a radius of 50m. At what angle is the curve banked so that the bob sled can safely negotiate the curve? A) 22 A Force (F) acting on an object is perpendicular to the displacement (s) of the object. How much work does this force perform on the object. B) 8.1 m/s C) 96 m/s D) 19.8 m/s B) 12 C) 808° D) 69.3° 9 A) no work B)Fxs C) depends on the magnitude of the force D) negative work 10If the speed of an object moving in uniform circular motion is doubled, the following statement is true B) the centripetal acceleration increases by a factor of 2 A) the centripetal acceleration stays the same. C) the centripetal acceleration increases by a factor of 4. D) the centripetal acceleration decreases by a factor of 4.

Answer 1

Here we shall solve four questions - Question 2, 3, 4 & question 9.

This question is based on the concept of

1. Work done

2. Acceleration

3. Newton's equation of motion

4. Case of perpendicular force

The detailed solution is described below

Soluhon R스 뀨 WoYK done an an object is nepahve (A) The reed f the obyect decseases reduces the speed 9.3 acceleration, a = ra 1 000 Fan Newtons en ota ウゾニ.[2 *23.* 8ㄱ

d= 2.50 m ー-45米R50 opionCO) Ctisplacenwut d is go Thuo, Work dne 0Pion A Thdeks!!

THANKS