2. The motor exerts a force F on the 40-kg crate as shown in the graph. Determine the speed of the crate when t = 3 s and when t = 6 s. When t = 0, the crate is moving downward at 8 m/s. F (N) 450 150 t(s) 6.
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- Q. A 980 W electric motor lifts a50 kg safe at a constant velocity. Find the vertical distance through which the motor can raise the safe in 6 s. (g-9.8 m/s) A) 6 m B) 18 m C) 9 m D) 5 m E) 12 m Lütfen birini seçin O A O B OD O EBOX 1.25m 34 Assuming no friction and the box starts at rest, what will be the speed of the box at the end of the ramp? m/s Word Bank: 4.9 We need the mass to calculate the speed 1.25 20 3.7 4.5 42.5A car's engine generates 80000 W of power as it exerts a force of 6000 N. How long does it take the car to travel 80 m? O a. 4.50s O b. 3.25s O c. 6.75s O d. 6.00s O e. 5.25s
- 2. Determine the velocity of the 60-lb block A if the two blocks are released from rest and the 40-lb block B moves 2 ft the incline. The coefficient of up kinetic friction between both blocks and the inclined planes is u, =0.10. %3D Use Constraint Equations (for pulley), Equation of Motion (Newton's second law), and the Principle of Work and Energy. NOT allowed to use Chegg or other such websites. NOT allowed to use Chegg or other such 30° 60° IA 1172 Physics4. The power provided by a force can also be written as P = dW /dt = F · d7/dt = F .ö. A force F = (3i – 2j + 6k)N is applied to an object moving with a velocity i = (2î – 3k) m/s. a. What is the power provided by this force? Does the object speed up or slow down or neither, if this force is the only unbalanced force acting on the object? b. Consider a force that is always perpendicular to the velocity. Does the object speed up or slow down or neither, if this force is the only unbalanced force acting on the object?
- For exercise, an athlete lifts a barbell that weighs 400 N from the ground to a height of 2.20 m at a constant speed in a time of 1.60 s. For the second time, the athlete completes the same task in 1.50 s. Match the answers with questions. metabolic energy metabolic power A. decreases B. increases C. not enough information D. stays the sameA 1400 kg car delivers a constant 42 hp to the drive wheels. We assume the car is traveling on a level road and that all frictional forces may be ignored.A) What is the acceleration of this car when its speed is 10 m/s?B) If the speed of the car is doubled, does its acceleration increase, decrease, or stay the same? Explain3. A 150. kg roller coaster is released from rest at the top of a 50.0 m hill. How fast will it be goingif the second hill is 10 m high?
- 3. A force of magnitude 5N acts on a 2 kg. body moving initially in the direction of the force with a speed of 4m/s. Over what distance must the force act in order to change the body's speed to 6m/s?17. Carlo whose weight is 600 N ran a distance of 800 meter in 2.0 minutes. Find his average kinetic energy * 204 J O 2000 J O c) 12240 J O d) 14000 J notaA car's engine generates 80000 W of power as it exerts a force of 6000 N. How long does it take the car to travel 70 m? O a. 4.50s O b. 6.00s O c. 5.25s O d. 3.25s O e. 6.75s