68. Numbers are used to represent the magnitudes and directions of forces that are unknown. True False 69. The free-body diagram is not important in the solution of problems in mechanics. O True O False 70. A force is a vector quantity because its effect depends only on the magnitude of the action. True False
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- A 1370 kg jeep traveling at 19 m/s can be stopped in 24.0 s by gently applying the brakes. a) What is the average force exerted on the jeep in this case? b) If the driver slams on the brakes, the jeep stops in 2.10 s. What is the average force exerted on the jeep in this case? c) How much time will it take it stop if the driver coasts and lets a 300 N friction force stop the car?Determine the force Q-> when the block moves with constant velocity. Express your answer in vector form.A 99-kg box, initially at rest on a frictionless surface, accelerates for 2 s over a distance of 100 m while acted on by a constant horizontal force P. Find the magnitude of P. P = N
- Tom enlists the help of his friend John to move his car. They apply forces to the car. F1 = 430 N and F2 = 347 N and friction is negligible. Mass of car = 3500 kg O1= -25 degrees and O2 = 12 degrees (assume the car faces the positive x-axis before the forces are applied. A) Find the force (in N) exerted on the car Magnitude = Direction (counterclockwise from the +x-Axis) = ______________ degrees B) What is the acceleration (in m/s squared) of the car? Magnitude = __________ m/s squared direction (counterclockwise from the +x-Axis) ______________ degreesA student is trying to find the force on a person at the top of an inverted roller coaster, where the person is upside down at the top, and writes the equation S + mg = mv 2/r. What would you say about that? A Yes, that’s correct. B Close, but it should be written S - mg = mv2/r. C Close, but it should be written mg - S = mv2/r.A stack of two crates is being accelerated upwards by two cables. The cables are directly attached to crate 1 and the tension in each cable is 3248 N. You may assume that the masses of the cables are negligible compared to the masses of the crates. The acceleration of the crates is? bottom crate crate 1 is 109 kg. the top crate is 248 kg.
- 10. Ā = -2â + -3ŷ and B = -4â + -4ŷ. Calculate R = Ã+B. Calculate 0, the direction of R. Recall that 0 is defined as the angle with respect to the +x-axis. A. 49.4° B. 130.6° C. 229.4° D. 310.6°A 4.2 kg bucket of water is raised from a well by a rope. If the upward acceleration of the bucket is 2.3 m/s2, find the force exerted by the rope on the bucket. N ?Two blocks on a horizontal, frictionless surface are in contact with one another, pushed by a horizontal force of magnitude P as shown below with m₁ = 3 kg, m₂ = 10 kg, and P = 8 N. Find the magnitude of the contact force F21 that block 2 exerts on block 1. P M2 m1
- A 7.8 kg object undergoes an acceleration of 2.9 m/s^2 A. What is the magnitude of the resultant force acting on it? N B. If this same force is applied to a 4.7kg object, what acceleration is produced? m/s^2A block of mass M is suspended at rest by two strings attached to walls, as shown in the figure. The left string is horizontal with tension force T2 and and the right string with tension force T, makes an angle e with the horizontal. g is the magnitude of the gravitational acceleration. Which of the following statements is true? Select all apply. T2 M O The net force along the y-component is non-zero. O The acceleration along the x-component is zero. O The net force along the x-component is zero. O The acceleration along the y-component is non-zero. O The acceleration along the y-component is zero. O The acceleration along the x-component is non-zero. O The net force along the y-component is zero. O The net force along the x-component is non-zero.A.) An 85.0 kg subject is strapped into a 1950's rocket sled. Upon firing the rocket sled's acceleration is a constant 5.00 m/s2. Find the force the subject experiences during this acceleration B.) The rocket sled (from above) is braked to a complete stop from v = 5.0 m/s in 3.0 s. What is the force on the subject? Express this force in "g's"