g hammer hits a nail and drives it into a wall. a) If the hammer hits the nail with twice the speed, how much deeper will the nail be driven? EXPLAIN your ANSWER using the WE theorem! b) If the hammer hit the nai
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A moving hammer hits a nail and drives it into a wall. a) If the hammer hits the nail with twice the speed, how much deeper will the nail be driven? EXPLAIN your ANSWER using the WE theorem!
b) If the hammer hit the nail with FOUR times the speed?
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- A car that was moving at 60 km/h skids 20 m with locked brakes. a) How far will the car skid with locked brakes if it was moving at 120 km/h? EXPLAIN your ANSWER using the WE theorem!I already asked this question and got an answer, but I don't understand in the solution the steps to get to the answer. So, here goes the question again. While walking along a solid ground your speed is v. If your speed becomes v/2 relative to the ground while walking forward over a movable platform, the platform moves with speed ____________ and direction __________. Give speed (in terms of v) and direction (forward or backward) in the blanks.43. This question is typical on some driver’s license exams: A car that was moving at 60 km/h skids 20 m with locked brakes. a) How far will the car skid with locked brakes if it was moving at 120 km/h? EXPLAIN your ANSWER using the WE theorem! b)At 180km/h?? EXPLAIN your ANSWER using the WE theorem!
- Consider two balls thrown separately from the top of a 50 m tall cliff. Ball 1 is thrown straight up into the air with a speed of 15 m/s and falls to the ground below. Then ball 2 is thrown straight down with a speed of 15 m/s and falls to the ground below. How does the speed of ball 2 just as it hits the ground, compare to the speed of ball 1 just as it hits the ground?A child is standing on the edge of a cliff overlooking a river. The cliff is 8 m above the edge of the river and the river is 20 m wide where the child is located. If the child can throw a rock with a speed of 20 m/s, will the rock make it across the river?A cannonball has an ejection velocity of 800 m/sec compared to a fixed cannon. Now we mount the gun on a carriage and neglect the friction forces. Let's assume that the gun-cart system has a mass of 2000 kg and that the balls have a mass of 10 kg; we have 5 balls on the cart. What will be the speed of the cannon and the first ball, with respect to the ground ? What will be the speed of the gun carriage relative to the ground after it fires the second ball? What will be the speed of the second ball relative to the ground?
- While playing a game of billards, your 0.50kg cue ball, travelling at 1.9 m/s glances off a stationary 0.30 kg billard ball so that the billard ball moves off at 1.3 m/s at an angle of 32 degrees clockwise from the cue ball's original path. What is the final speed of the cue ball?Running a car’s air conditioner usually increases fuel consumption. But, at certain speeds, a car with its windows open and with the air conditioner turned off can consume more fuel. Explain.Please do help me in this physics questions please. I promise to give a good feedback and perfect score.. Please i badly need it in 1 hour from now. This is already an answered equations/problems. All i need to know is to know if why is it kinetic energy etc. is indicated in here. And why the symbol in this particular parts is equals or plus and minus. Or a complete explanation on why this is my answer and where did i get it from. PLease, i do hope you could help me. I promise to give a perfect score as a feedback.
- We are now able to define a mathematical formula for gravitational potential energy. Near the Earth's surface, the gravitational potential energy of a system consisting of the earth and an object with a mass m is EP = mgh, where g is the acceleration of gravity (9.80 m/s2) and h is the height above ground level (positive upward). Note that the "ground level" could really be any height we choose, because what's really important is the change in potential energy. The difference between two heights always gives the same change in potential energy, regardless of where we set the "zero" of height. In other words, if we find the change in potential energy ΔEP = EP,f − EP,i, the final potential energy minus the initial, we have ΔEP = mghf − mghi = mgΔh. The change in gravitational potential energy is just mg times the change in height. Let's return to our ball-Earth example, only now let's examine a case where a ball is rising in the air. You toss a ball with a mass of 0.703 kg upward.…Gab, a professional rooftop futbol player, kicked a 0.45 kg ball off a rooftop that is 81 m off the ground, at 15 m/s oriented 45° above his horizon. His pal, Henry, caught the ball from a window at a distant building that is 46 m off the ground. Henry then released the ball from this height and let the ball fall to the ground. A. What is the speed of the ball just before it reaches Henry? B. What is the speed of the ball just before it reaches the ground?You were playing POP POP crackers with your neighbor's kids. To show off your speed, you threw a POP POP cracker at an initial speed of 7.0 m/s downward. The height above ground where you let go of the cracker was about 1.0 m. The cracker popped upon impact with the ground. How long did the kids have between the throw (you let go of the cracker at its initial speed) and the pop (the cracker impacts the ground) to cover their ears and scream? You can assume the final position to be zero. The cracker has negligible amount of air drag. Hint: the cracker has a downward initial velocity. Please include enough significant figures (3 sig. figs.) to ensure your answer is within 5% of the correct answer.