A 20 g bug is hovering in the air. A gust of wind exerts a force F = (5.0 î + 2.0 j) × 10-2N c the bug. %3D A. How much work is done by the wind on the bug as the bug undergoes a displacemer Ař = (2.0î + 1.0 ĵ) m? What is the bugS speed at the end of this displacement
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- 39 A 1.00 kg block slides down a 20.0 meter ramp at a constant velocity. The angle of inclination of the ramp is 30°. How much work is done by friction? Ans. 98.0 J 45. A car pulls a trailer with a force of 2000 N at 20.0 m/s. What is the Ans. 4.00 x 104 Watts power exerted?= 13 kg, and m3 20 kg, respectively, are attached by strings over frictionless pulleys as indicated in the figure below. The horizontal surface 3.4 kg, m2 %3D Three objects with masses m, exerts a force of friction of 30 N on m,. If the system is released from rest, use energy concepts to find the speed of m, after it moves down 4.0 m. m/s m2 m1 m3Wfric Suppose the ski patrol lowers a rescue sled and victim, having a total mass of 100.0 kg down a 60° slope at constant speed, as shown in the figure. The coefficient of friction between the sled and the snow is 0.100. = (a) How much work is done by friction as the sled moves 30.0 m along the hill. Enter to 3 significant figures Wrope 1.47 × 10³ J = W grav 60° (b) How much work is done by the rope on the sled in this distance? Hint: use Newton's second law to find the tension. Enter to 3 significant figures W -2.39x104 T = 2.55×104 J (c) What is the work done by the gravitational force on the sled? Enter to 3 significant figures
- Humans can produce an output power as great as 20 W/kgW/kg during extreme exercise. Sloths are not so energetic. At its maximum speed, a 4.0 kgkg sloth can climb a height of 6.0 mm in 2.0 minmin. (Figure 1) a. How much work does the sloth do against gravity to climb 6.0 mm? b.What is the sloth’s specific power output during this climb? Express your answer in watts per kilogram.A.707 J B.170 J C.117 J3. A 26.00-kg child initially at rest slides down a playground slide from a height of 3.20 m above the bottom of the slide. If her speed at the bottom is 2.80 m/s, how much energy is lost due to friction? J cci16 f16 cci16 ceil6 cci
- 24. A skier of mass 70 kg is pulled up a slope by a motor-driven cable. How many horsepower output must a motor have to pull him 100 m up a 30° frictionless slope at a constant speed of 2 m/s? a.700 b. 0.94 c. 746 d. 1.06 a b dQ. A bead of mass m, which is attached to a vertical metal ring of radius R, reaches point D by passing through points B and C when released from point A. What is the speed of the bead at point D? A. 2gR B. gR 2g С. V R D. 0 Е. MgSuppose a 85 kgkg sprinter, starting from rest, runs the first 14 mm in 3.0 ss at constant acceleration, a reasonable model. a. What is the magnitude of the horizontal ground force acting on the sprinter? b.What is the sprinter's power output at 1.0 ss, 2.0 ss, and 3.0 ss?