A man exerts a force of 2 KN on a boulder but fails to move it. Calculate the work done. O a. Zero O b. 0.6 m O c. 6.0 m O d. 0.6 cm
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- B3In the figure shown, if the mass (m36 Kg) is moving with constant speed and traveled a distance d=10 m, what is the work done in Joules by frictional force? Given that F =23N and e =53°. A -415.2 B. None C. -553.7 D. -138.4 E. -276.8If an object of mass 2.00 kg is dropped from rest into free fall from some height where it has +5.00 Joules of gravitational potential energy, then what kinetic energy will it have when its height is zero? a. 5.00 J b. 4.00 J c. 10.0 J d. 2.00 J e. zero J
- 3. A 60 kg boy does 60 push-ups in 40 s. With each push-up he must lift an average of 70 % of his mass a height of 40 cm off the floor. Calculate the following: a) the work the boy does for each push-up, assuming he does work only when he pushes up b) the total work done in 40 s c) the power for this periodA child pulls a wagon 5.0 m using a force of 25 N at an angle 15 degrees above horizontal. The force of friction on the wagon is 8.1 N. Calculate the work done on the wagon in the horizontal direction. a. 6.5 J b. 24.1 J c. 32.5 J d. 80 J e. 84.5 J f. 125.1 J g. 125 J h. don't be silly, you can't calculate the net work without the change in KE!!3. A backhoe pushes a rubbish pile with a force of 1200 N for a distance of 400 meters. It takes the backhoe 30 seconds to move the rubbish pile. Calculate the work performed by the backhoe on the rubbish pile. Calculate the power of the backhoe pushing the rubbish pile.
- A particle moves 5 m in the +x direction while being acted upon by a constant force F = 2i + 5j– k N. The work (in Joules) done on the particle by this force is Select one: O a. 16 O b. -5 O c. 12 O d. 25 O e. 101. Two ropes pull on a crate toward the left with forces of equal magnitude, F, causing the crate to move horizontally (Figure 9). Which rope does more work on the crate? Explain. F, <In the Figure below, we see a 500 gram block resting on the horizontal portion of a "track", whose left end is curved upwards. The horizontal portion of the track is frictionless, except for a 50.0 cm long “rough" portion, shown in the Figure, where the coefficient of kinetic friction is 0.300. The curved portion of the track is frictionless. The block is held against a spring (which has a stiffness constant of 500 N/m), compressing the spring by 10.0 cm. Then the block is released from rest. (NOTE: The block is not attached to the spring; it is just held against the end of the spring.) For simplicity, assume that g = 9.80 m/2. 50.0 cm
- Two persons weigh same and climb the same flight of stairs. Person 1 takes 3 sec and person 2 takes 5 sec. Choose all that apply. A. Person 1 has more power. B. Person 2 has more power. C. Person 2 does more amount of work. D. Both persons do the same amount of work.Young Hector launches a 200 gram block uphill on a frictionless ramp which is tilted at 30 degrees with the horizontal, as shown in the Figure. At the instant of its launch, the block is moving uphill at 4.00 m/s. Hector observes as the block travels a distance of 50.0 cm uphill on the ramp. In the following, consider the period of time during which the block moves uphill through the 50.0 cm distance shown in the Figure. For simplicity, assume that g = 9.80 m/2. d (50.0 cm) 4.00 m/s h 30°