Question 12: A block of mass m is released at rest at height h. It is undergoing a circular motion around a loop of radius R represented by a dashed line as shown in Figure 6. Find the net force acting on the block at point B (at this position, the normal force on the block is directed horizontally, g is the gravitational acceleration). m AB Figure 6
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- A rocket takes off from Earth's surface, accelerating straight up at 75.2 m/s. Calculate the normal force (in N) acting on an astronaut of mass 85.4 kg, including her space suit. (Assume the rocket's initial motion parallel to the +y-direction. Indicate the direction with the sign of your answer.) HINT NWhen serving a tennis ball, the player hits it when its velocity is zero (at the highest point of a vertical toss). The racket exerts a force of 530 N on the ball for 5.00 ms, giving it a final velocity of 44.0 m/s. Using these data, find the mass of the ball. g Additional Materials I ReadingPart A A block lies on a plane raised an angle e fram the horizantal. Three forces act upon the block: Fw, the force of gravity. Fn. the narmal force; and Fr. the force of friction. The coefficient of friction is large enaugh to prevent the block from sliding (Figure 1). Consider coordinate system a, with the x axis along e plane. Which forces lie along the axes? O Ée arly O F, anly O F. only O ři and F. O ř and F. O řa and F. O ř and řa and ř. Submit Requect Ancwor Part B Which forces lie along the axes af the coordinate system b, in which the y axis is vertical? O F anly O F. anly O F. only O F and P, O ř and F. O F, and F. O řr and Fa and Ě, Submit Request Answer Usually the best advice is to choose a coordinate system so that the acceleration of the system is directly along one of the coordinate axes. If the system isn't accelerating, then you are better off choosing the coordinate system with the most vectors along the coordinate axes. But now you are gaing to ignore that advice.…
- Part A Find the magnitude of the force the Sun exerts on Neptune. Assume the mass of the Sun is 2.0x1030 kg, the mass of Neptune is 1.02x1026 kg, and the orbit is 4.50x10° km. Express your answer with the appropriate units. HÀ F = Value Units Submit Request Answer Ne Provide Feedback 4 MacBook F7A uniform wire with mass M and length L is bent into a semicircle. Part A Find the magnitude of the gravitational force this wire exerts on a point with mass m placed at the center of curvature of the semicircle. Express your answer in terms of G, M, m, L, and T. F =A mass m is at rest on a horizontal frictionless surface at t = 0. Then a constant force Fo acts on it for a time to. Suddenly the force doubles to 2 Fo and remains constant until t = 2to- Part A Determine the total distance traveled from t = 0 to t = 2to- Express your answer in terms of the variables m, Fo, to, and appropriate constants. d = ΓΙ ΑΣΦ ?
- A B Two blocks are arranged as shown. Block A is on a frictionless table and has mass 5.1kg and block B has mass 2.8kg. Determine the magnitude of the acceleration of block B.A 4.0 × 10¹ kg spaceship is at rest in deep space. Its thrusters provide a force of 1200 kN. The spaceship fires its thrusters for 20 s, then coasts for 17 km. Part A How long does it take the spaceship to coast this distance? Express your answer with the appropriate units. IBlocks with masses of 3.0 kg, 4.0 kg, and 5.0 kg are lined up in a row on a frictionless table. All three are pushed forward by a 15 N force applied to the 3.0 kg block. Part A How much force does the 4.0 kg block exert on the 5.0 kg block? Express your answer with the appropriate units. HA F4.0 on 5.0 = Value Units Submit Previous Answers Request Answer X Incorrect; Try Again; 3 attempts remaining Part B How much force does the 4.0 kg block exert on the 3.0 kg block? Express your answer with the appropriate units. HA F4.0 on 3.0 = Value Units
- v Question Completion Status: QUESTION 18 As shown in the figure below, a force pushes two mass bodies (mass m, and m) together moving to right horizontally with a constant acceleration on a frictionless and as shown above. With E=10 N, m, = 11 kg, and m,= 13 kg, what is the surface, In the contact surface between m, and m., there are contacting forces E 21 magnitude of F, N Please write your numerical answer with all digits and do not use (Note: For fill in blank, I have set the unit for the answer. So, you just need to provide a number scientific notation. If you are not sure about the number of significant figures, you can keep the number of figures as many as possible - You will not be punished for doing this.) F21 m1 Click Save and Submit to save and submit. Click Save All Answers to save all answers. Type here to searchA car roundsa flat circular track with radius 215 m. The coefficient of static friction between the tires and track is 0.70. Part A What's the maximum speed for the car if it's to stay on the track? Express your answer to two significant figures and include the appropriate units. ? Value Units Request Answer Submit