7. Review. Three forces acting on an object are given by F, V (-2.00î + 2.00j) N, and F, =(5.00î – 3.00j) N, and F (-45.0i) N. The object experiences an acceleration of mag- nitude 3.75 m/s². (a) What is the direction of the accelera- tion? (b) What is the mass of the object? (c) If the object is initially at rest, what is its speed after 10.0 s? (d) What are the velocity components of the object after 10.0 s? 3
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- A ball falls from height of 12 meters. Each time that the ball hits the ground the ball bounces of original height. Calculate the full distance run by the ball if it stops after six 6 bounces. ○ 50 m 96 m о о 48 m ○ 84 mplease please help!!2. An object of mass 200 g (0.2 kg) is thrown vertically upwards with a velocity of 8 m/s from a height of 10 m above the ground. It reaches certain maximum height and falls straight back to ground. Ignore air resistance in this problem. (a) Draw v-t graph that represents the velocity of the object after it is launched upwards and until it hits the ground. (b) How long does it take for the object to reach the maximum height? (c) What is the maximum height of the object from the ground? (d) How long does it take for the object to reach the ground from the highest point of motion? (e) What is the velocity of the object as it reaches ground? (Hint: Not zero).
- 2. A 60 kg skateboarder comes over the top of a hill at 5.0 m/s, and then skates down an increasingly steep grade to a point halfway above the bottom of the hill, before rolling out on a much gentler slope near the bottom. The boarder's speed at the bottom of the hill is 10 m/s. (Ignore friction for this problem.) 75 S (a) Is the acceleration of the boarder down the hill constant? Explain why or why not. (b) Find the net work done on the skateboarder between the top and bottom of the hill.If D+E = 6.0i and D - E = 21 – 4j: then Dequals a. 8î – 4j O b.4î – 2j OC. 2î – 4j O d. 6î8. A 200 kg weather rocket is loaded with 100 kg of fuel and fired straight up. It accelerates upward at 30 m/s² for 30 s, then runs out of fuel. Ignore any air resistance effects. (a) What is the rocket's maximum altitude? (b) How long is the rocket in the air before hitting the ground?
- A 1500 kg car was moving +31 "½ (E) in the exit lane, but 7.0 s later only +10 m/ (E) at the S exit ramp. b) compute the car's displacement (vector!) if its acceleration was constant during that interval O +217 m (E) +70 m (E) O +143.5 m (E) O +290.5 m (W) O +73.5 m (E) O -73.5 m (W)Advanced Physics QuestionThe force F has a magnitude of 770 N. Express F as a vector in terms of the unit vectors i and j. Identify the x and y scalar components of F. Assume F-770 N, 8-23° Answers: F- i i+ i j) N Fx- i N Fy- i N
- 3. Bob (52.0kg) was curious about the amount of air resistance (friction) that would act on him as he fell through the air, so he conducted an experiment. He stepped out of a third story window, 15.0m above the ground, and measured that it took 1.94s to hit the ground (don't worry, there was a soft mat to cushion the impact). Assuming his initial velocity was zero as he stepped out of the window, determine the force of air friction that acted on Bob as he fell.At the Earth's surface, a projectile is launched straight up at a speed of 7.5 km/s. To what height will it rise? Ignore air resistance. 2.87e+06 Your response differs from the correct answer by more than 10%. Double check your calculations. m5. A student throws a 0.1 kg ball into the air. (A) Just after the ball leaves their hand, it has a velocity of 5 m/s. (B) At the peak of its motion, it has a velocity of 2 m/s. Assuming no air resistance, to what height dịd the student throw the ball? Also, assume the ball started at h=0 (The zero-reference line is at the starting position of the ball). The energy chart is optional. KE- Vz- Poson A SystemFlow Poston KE- 1.2SJ@ A KE /2..1.2 KE- 0.25 @B Etr E, E Ea Et E, E En Energy Equation KETGPE = KE + GPE 6. A parachutist of mass 50.0 kg jumps out of a stationary balloon at a height of 1,000 meters. The system consists of the parachutist and the Earth, if the parachutist lands with a speed of 5.0 m/s, how much energy was transferred out of the system (so energy transferred to something else)? 7. Suppose the spring below has a spring constant of 50. N/m. The box has a mass of 8.0 kg and rests on a surface of negligible friction. In the diagram above, the spring was compressed 4.0 m.…