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- Your forehead can withstand a force of about 6.0 kN before fracturing, while your cheekbone can withstand about 1.3 kN. If a 140 g baseball strikes your forehead at 25 m/s and stops in 1.7 ms, are you in danger of experiencing a fracture? What about if the ball hits your cheek instead?A 6.1-g bullet has a velocity of 475 m/s when it penetrates a wooden door to a depth of 3.5 cm. Assuming the frictional force that stops the bullet is constant, how long does it take from the time the bullet hits the door till it comes to a stop? Group of answer choicesIf you drop a ball onto a surface from a height of 1 meter and the ball rebounds to a height of 32 centimeters, what is the coefficient of elasticity for the ball?
- In a classroom demonstration, a 79.2-kg physics professor lies on a "bed of nails." The bed consists of a large number of evenly spaced, relatively sharp nails mounted in a board so that the points extend vertically outward from the board. While the professor is lying down, approximately 1950 nails make contact with his body. 7. What is the average force exerted by each nail on the professor's body? A) 0.201 N B) 0.398 N c) 1.42 N D) 0.809 N E) 142 N 8. If the area of contact at the head of each nail is 1.26 x 10 m², what is the average pressure at each contact? A) 1.58 x 10° Pa B) 1.27 x 10° Pa C) 2.40 x 10 Pa D) 4.82 x 10 Pa E) 3.16 x 10° Pa(Figure 1)shows a 250 g hamster sitting on a 750 g wedge-shaped block. The block, in turn, rests on a spring scale. An extra-fine lubricating oil having μs=μk=0μs=μk=0 is sprayed on the top surface of the block, causing the hamster to slide down. Friction between the block and the scale is large enough that the block does not slip on the scale. What does the scale read, in grams, as the hamster slides down?What factors would affect the elasticity of an object?
- The towers holding small wind turbines are often raised and lowered for easy servicing of the turbine. (Figure 1) shows a 1100 kg wind turbine mounted on the end of a 24-m-long, 500 kg tower that connects to a support column at a pivot. A piston connected 3.0 m from the pivot applies the force needed to raise or lower the tower. At the instant shown, the wind turbine is being raised at a very slow, constant speed.What magnitude force is the piston applying?We are going to create a model for the forces acting when climbing with mass 'm' while falling on a rope. To simplify the problem, we will assume that there is no external or internal friction on the rope, and that there is no slack in the rope when the climber falls a height 'h/2' above the last belay, as shown in Figure. The rope has a length 'L' (in meters) when the fall occurs. All movement in the model is vertical (along the y-axis), and we will assume that the positive direction is downward. In part (a), the climber is in free fall until the rope starts to catch the fall. Set up the model for free fall and derive the expression for the velocity v0 that the climber has when the rope starts to slow down the fall. You can assume that the climber's speed is only a function of 'y' such that dy/dt = v(y)⟹ d²v/dt² = v * dv/dyA 70 Kg person walking at 1 m/sec bumps into a wall and stops in a distance of 2.5 cm in about 0.04 sec. what is the force developed on impact ? Your answer
- During a heavy resistance training exercise the valsalva maneuver is used to: Question 27 options: decrease rigidity of the lower torso and increase blood pressure decrease rigidity of the lower torso and decrease blood pressure increase rigidity of the lower torso and decrease blood pressure increase rigidity of the lower torsal and increase blood pressure Question 28 Which of the following is the definition of power? Question 28 options: mass X acceleration force X distance force X velocity tourque X timeTwo simple pendulums of equal length l=0.45 m are suspended from the same point. The pendulum bobs are small solid steel spheres. The first bob is drawn back to make a 35° angle with the vertical, while the other one is left hanging at rest. If the first bob has a mass of 0.25 kg and the second has a mass of 0.54 kg, how high will the second bob rise above its initial position when struck elastically by the first bob after it is released?Determine the magnitude and location of the resultant of the force systems shown in Figure 6. 20 N 5 NA 0.5 mx 2 m 1/1 mm Z FIGURE 6 4 m 10 N
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