. . 77., . .. u = A Red Rider bb gun uses the energy in a Compressed spring to provide the kinetic energy for propelling a small pellet of mass 0.21 grams. By cocking the lever attached to the stock of the rie, the spring (k = 1800 N/m) is Compressed 8 cm from its equilibrium point. What is the potential energy energy stored in the compressed spring? 5.7600 J Computer's answer now shawn above. Incorrect. Tries 2/2 Previous Tries What is the kinetic energy of the pellet when the spring is released? J SumetAnswer ' Tries 0/2 What is the muzzle velocity of the bb? m/s Submit Answer Tries 0/2 If the rifle was modified so that the spring could be compressed twice as far, 16 cm, what would be the resultant muzzle velocity of the bb? m/s Submit Answer ' Tries 0/2 Front View A disk is rotating on a horizontal axis as shown in the figure. Answer the following questions if you pull out at A and push in at B along the axis of the disk. What is the direction of the torque acting on the disk? Incorrect in Correct: up Incorrect left Incorrect down Incorrect right Incorrect out Computer's answer now shown above. Incorrect. Tries 2/2 Previous Tries What is the direction of the initial angular momentum vector for the disk? O right O out O in O down O left O up To find the Angular Momentum of the spinning wheel, ignore the bar and just observe the wheel. The Angular Momentum, L, will be in the same direction as the angular velocity. Submit Answer Incorrect. Tries 1/2 Previous Tries The applied torque causes the wheel's axis (or angular momentum vector) to move. From the front view, what is the direction of motion of the L vector? Correct: counter clockwise (CCW) Incorrect clockwise (CW) Computer's answer now shown above. You are correct. Your receipt no. is 154-6573 (? Previous Tries Front View A disk is rotating on a vertical axis as shown in the figure. Answer the following questions if you pull right at A and pull left at B along the axis of the disk. What is the direction of the torque acting on the disk? O up O in O down O left O out O right When finding the Torque, ignore the spinning wheel. Imagining a bar (similar to the handle bars on your bike) that is pivoting around the center. Your r-vector is from the center out, so the r-vector for A and B should be in opposite directions. Using the r-vector and the force- vector, use the right hand rule to find the direction of the Torque. The direction of the torque should be the same for both A and B. Remember that "in" means into the page or screen and "out" means out of the page or screen. Submit Answer Incorrect. Tries 1/2 Previous Tries What is the direction of the initial angular momentum vector for the disk? out O down O in O left O right O up To find the Angular Momentum of the spinning wheel, ignore the bar and just observe the wheel. The Angular Momentum, L, will be in the same direction as the angular velocity. Submit Answer Incorrect. Tries 1/2 Previous Tries The applied torque causes the wheel's axis (or angular momentum vector) to move. From the right view, what is the direction of motion of the L vector? Incorrect counter clockwise (CCW) Correct: clockwise (CW) Computer's answer now shown above. You are correct. Your receipt no. is 154-9668 (? Previous TriesA ring (4 kg, r = 2 m) rotates in a CW direction with initial angular velocity 10 s". A disk (4 kg, r = 2 m) rotates in a CCW direction with initial angular velocity 40 s". The ring and disk "collide" and eventually rotate together. Assume that positive angular momentum and angular ----rond to rotation in the CCW direction. Next content resource What is the initial angular momentum L of the ring+disk system? kg m2 s-1 Submit Answer Tries 0/3 What is the final angular velocity wf of the ring+ disk system? S-1 Submit Answer Tries 0/3The displacement of an oscillating mass is given by x(t) = 10 cos( 5 t). At time t = 0.5n 5, what is the velocity of the mass in m/s? (Note that: n = 3.1415) Tries on An earth-like planet has a mass of 4.00x 1024 kg and a radius of 6000 km. A satellite of mass 62 kg is orbiting the planet at a distance of 5000 km above the surface. What is the magnitufe of the gravitational force exerted on the satellite by the planet? (We can simplify the Gravitational Constant G to 6.7x10-11 Nm2/kg) N Submit Answer | Tries 0/2 What is the magnitude of the force exerted on the planet by the satellite? N Submit Answer Tries 0/2Block 1 (10 kg) is pulled by a rope from left to right up a ramp which is inclined 45 degrees from the horizontal. The rope pulls on block 1 with a force of 150 N parallel to the surface of the inclined plane. The coefficient of kinetic friction between the block and the surface equals 0.4. Assume that the x-axis is parallel to the incline and positive in the direction up the incline. What is the magnitude of the acceleration a of block 1? a = 9.05 m/s2 Use Fnet = ma and solve for the acceleration. There is no vertical acceleration component. Submit Answer Incorrect. Tries 1/2 Previous TriesLeft Right Down A spinning disk is rotating at a rate of 4 rad/s in the clockwise direction as shown in the figure. What is the direction of the angular velocity vector? Correct: down Incorrect right Incorrect left Incorrect up Computer's answer now shown above. You are correct. Your receipt no. is 154-4768 Q) m If the disk is slowing down at a rate of 2 rad/52, what is the direction of the angular acceleration vector? Correct: up Incorrect left Incorrect down Incorrect right Computer's answer now shown above. You are correct. Your receipt no. is 154-9846 Q) m Find the wheel's angular velocity after 2 s. 0 rad/s Computer's answer now shown above. You are correct. Your receipt no. is 154-5270 @ m Find the angle through which the wheel has turned after 2 sin radians. -4 radians Computer's answer now shown above. You are correct. Your receipt no. is 154-3099 Q) m Find the magnitude of the velocity (speed) of a point located at r = 20 cm from the center of the wheel after 2 5. :m/s Submit Answer Tries 0/2 Find the magnitude of the parallel acceleration of the point in the above part. :mxsz Tries 0/2