A lamp hangs vertically from a cord in a descending elevator that decelerates at 1.9 m/s2. (a) If the tension in the cord is 68 N, what is the lamp's mass? (b) What is the cord's tension when the elevator ascends with an upward acceleration of 1.9 m/s?? (a) Number Units (b) Number Units
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- A cable lowers a 1050 kg elevator so that the elevator's speed increases from zero to 4.0 m/s in a vertical distance of 5.9 m. what is the force that the cable exerts on the elevator while lowering it? (Assume that the system is the elevator man)A lamp hangs vertically from a cord in a descending elevator that decelerates at 2.9 m/s². (a) If the tension in the cord is 66 N, what is the lamp's mass? (b) What is the cord's tension when the elevator ascends with an upward acceleration of 2.9 m/s²? (a) Number (b) Number Units Units(Each question reads 18pts and the magnitude g of the gravitational acceleration ⃗g is g = 9.81m/s2)Q1) A block of mass m = 1kg, to which a spring of spring constant k = 43N/m is attached, stands on a horizontal plane. If the spring attached to that block can be stretched horizontally with an amount of 14.8cm until the block skids, what is the coefficient of static friction between the block and the surface of the plane? (Assume that the spring is ideal; ignore the mass of the spring)
- A 1000-kg elevator is rising and its speed is increasing at 3 m/s2. The tension force of the cable on the elevator is:A lamp hangs vertically from a cord in a descending elevator that decelerates at 2.6 m/s?. (a) If the tension in the cord is 60 N, what is the lamp's mass? (b) What is the cord's tension when the elevator ascends with an upward acceleration of 2.6 m/s? (a) Number i Units (b) Number i Units >Suppose you are pushing a box across the floor. The box has a mass of 50.0 kg, and there is a constant force of friction opposing your push of 75.0 N. As you push the box, it accelerates from rest to a speed of 2.50 m/s in 15.0 seconds. (a) What is the force of your push, in Newtons? (b) Suppose the box had a mass of 25.0 kg, and you pushed in with the same for that you found in part (a). What would the acceleration of the box be? How long would it take to reach a speed of 2.50 m/s, starting from rest?
- QHQBP A(n) 11 kg mass is on an incline, with a = 4.7_m and b = 2.3_m. The coefficient of kinetic friction between the mass and the surface of the incline is k = 0.38. If the mass is initially near the top of the incline and sliding down, then what is the mass's acceleration down the incline? m b 16. 0.9627_m/s² 1.041_m/s² 1.103 m/s² A. B. C. 1-1 a D. E. F. 1.137 m/s² 1.01 m/s² 1.073_m/s²Many birds can attain very high speeds when diving. Using radar, scientists measured the altitude of a barn swallow in a vertical dive; it dropped 208 m in 3.0 s. The mass of the swallow was estimated to be 0.018 kg, and its cross-section area as 5.6 x 10-4 m2. What was the drag coefficient for this swallow as it dove?A lamp hangs vertically from a cord in a descending elevator that decelerates at 1.7 m/s2. (a) If the tension in the cord is 63 N, what is the lamp's mass? (b) What is the cord's tension when the elevator ascends with an upward acceleration of 1.7 m/s2?
- You push a box up a slope with kinetic friction at a constant speed. Which of these is true? O AK = 0, AUg > 0, AEmech > 0, AÉth > 0 O AK > 0, AUg > 0, AEmech >0, AEth > 0 O AK = 0, AUg > 0, AEmech = 0, AEth > 0 O AK > 0, AUg 0Two crates of fruit are released from the top of a ramp inclined at 30 degrees from the horizontal and 4.5 meter long. The two crates consist of an apple crate of mass 20 kg that is placed in front of a watermelon crate of mass 80 kg. The apple crate has a coefficient of friction of 0.20 while the watermelon crate has a coefficient of friction of 0.15. How long does it take the apple crate to reach the bottom of the incline if it needs to travel a distance of 4.5 meters?Redo Example 5, assuming that there is no upward lift on the plane generated by its wings. Without such lift, the guideline slopes downward due to the weight of the plane. For purposes of significant figures, use 2.91 kg for the mass of the plane, 12.2 m for the length of the guideline, and 18.2 and 36.4 m/s for the speeds. (a) Number (b) Number Units Units