Mohamad is driving a car with a speed of 19 m/s when he sees Ahmed 60 m away. If he manages to stop right before colliding with Ahmed, what is the coefficient of kinetic friction of Mohamad's car? 우 60 m
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- Professional golfers can drive the ball over 200 m. While air resistance is significant, its effects are nearly canceled because lift is gained from backspin on the ball, and so a reasonable description of the ball’s trajectory is obtained if air resistance is neglected. Suppose a golfer hits a ball 200 m on level ground, giving it an initial velocity at an angle of 45o. The duration of the impact of the club and ball has been measured to be 1.00 ms. a) Calculate the velocity of the ball just after it is struck b) What is the 0.0450 kg ball's change in momentum?A kid throws a balloon at an angle of 69 degrees towards his friends who is 7 m away. a. How fast would the water ballon leave the kids hand so that it hits his friend at the same level it was thrown? Give answer in m/s.Anna Shcherbakova is a 2022 Beijing Olympics figure skating gold medalist for ladies’ singles.After warming up she starts her practice by skating towards the middle of the ice rink, 14 metersfrom the entrance. However, this time, one of her friends decided to trick her by pushing hertowards the middle at a velocity of 1.2 m/s (disregard friction between the ice and her skates).Recovering from the shock 2 seconds after, she starts pushing herself forward at an accelerationof 0.5 m/s2. What velocity will she have when she reaches the middle of the rink?
- If pellets shot at the same angle are compared, which of thefollowing is true?A. A lighter pellet travels farther because of its higher ejection speed.B. A heavier pellet travels farther because it is launched morehorizontally.C. Pellets of all masses travel equally far because the launch angleis the same.A demonstration of reaction time is to hold one end of a dollar bill so that it hangs lengthwise below your fingers, then ask a friend to hold his fingers near the lower corner of the bill. When you release the bill, he is to try to catch it. If a typical reaction time in this case is 0.25 s, how long would a bill need to be for a person to have a good chance of catching it?Measurements of a shot recorded on a videotape during a basketball game are shown below. The ball passed through the hoop even though it barely cleared the hands of the player B who attempted to block it. Neglect the size of the ball. I need help in finding the magnitude of the ball's initial velocity vA and the height h of the ball when it passes over player B please show complete solution, thanks.
- The time it takes for a projectile to go up to its' maximum height is the same amount of time that the projectile takes to fall from its' maximum height back down to its initial height. True or falswWhich expression correctly gives the total time the projectile spends in the air? t = _______ a) vi/g b) 2vi/g c) vi sin(θ)/g d) 2 vi sin(θ)/gA physicist is studying the position of a baseball being thrown up in the air. He notices that the baseball goes up in the air and then comes back down. Which equation could model how high the baseball is off the ground over time?
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