Terry is standing in an elevator on a scale

A crate remains stationary after it has been placed on a ramp inclined at an angle with the horizontal. Which of the following statements must be true about the magnitude of the frictional force that acts on the crate? (a) It is larger than the weight of the crate. (b) It is at least equal to the weight of the crate. (c) It is equal to sn. (d) It is greater than the component of the gravitational force acting down the ramp. (e) It is equal to the component of the gravitational force acting down the ramp.

Two objects, A and B, are connected by a rigid rod that has a length L. The objects slide along perpendicular guide rails, as shown in Figure P2.57. If A slides to the left with a constant speed v, find the velocity of B when α = 60.0°. Figure P2.57

A 68.5 kg person is standing inside an elevator. The elevator is going from the 1st floor to the 9th floor. As the elevator approaches the 9th floor there is a moment when the elevator’s speed is 2.90 m/s and is slowing at a rate of 0.904 m/s2. What is the net force acting on the person at this moment?

You are standing on a bathroom scale in an elevator in a tall building. Your mass is 64 kg. The elevator starts from rest and travels upward with a speed that varies with time according to v(t) = (3.0 m/s2)t + (0.20 m/s3)t2. When t = 4.0 s, what is the reading on the bathroom scale?

A 60 kg person stands on a scale in an elevator.  How many Newtons does the scale read: a)   when the elevator is ascending with an acceleration of 1 m/s2? b)   when the elevator is descending with an acceleration of 1 m/s2? c)   when the elevator is ascending at a constant speed of 3 m/s?

Consider two blocks hung by a massless string from a frictionless pulley as shown in the figure. The masses of the blocks are m1=5 kg and m2=7 kg. The bottoms of the blocks are 20 meters above the top of the table. While m2 is accelerating downward, what is the magnitude of the tension in the string (within 5% accuracy)? * m1 m2 49 N 57 N 69 N 80 N

A 67.3 kg person is standing inside an elevator. The elevator is traveling from the 1st floor to the 8th floor. As the elevator passes the 7th floor it is traveling at a speed of 3.02 m/s and is decelerating at a rate of 1.39 m/s^2. At that moment, what is the net force acting on the person?

The strings and frictionless pulleys have negligible masses.  The coefficients of kinetic friction is 0.25 and static friction is 0.30.  Block A has a mass of 3 kg and block B has a mass of 4 kg.  a) What is the maximum mass block C can have before block B will start to move?  b) If block C has a mass of 7 kg and was 1 m above the ground, how long would it take block C to hit the ground starting from rest?

Question #1: A unicorn running on a beach at 7 m/s changes speed at a constant rate of 3.6 m/s2 over a period of 3 seconds. What distance did the unicorn travel during this process? Question #2: 60-kg woman in an elevator is accelerating downward at a rate of 1.2 m/s2. What is the magnitude of the force exerted by the elevator floor on the woman's feet? Question #3: Two people play tug of war. The 100-kg person on the left pulls with 1,200 N, and the 70-kg person on the right pulls with 800 N. Assume that neither person releases their grip on the rope with either hand at any time, assume that the rope is always taut, and assume that the rope does not stretch. What is the magnitude of the tension in the rope in Newtons? Question #4: A man pulls a 14-kg sled 44 meters along an angled hill with a force of 95 N, which elevates the man 30 meters above the bottom of the hill. The man then hops on his sled and slides to the bottom of the hill back along his 44 meter path, during which a 296 N…