Showing 211 to 220 of 494 Questions

Bill can throw a ball vertically at speed 1.5 times faster than Joe can. How many times higher will bills ball go than Joe’s?
0648 
You stand at the top of a cliff while your friend stands on the ground below you. You drop a ball from rest and see that it takes 1.2s fro the ball to hit the ground below. Your friend then picks up the ball and throws it up to you, such that it just comes to rest in your hand. What is the speed with which your friend threw the ball?
0143 
Two students are asked to find the height of a particular building using a barometer. Instead of using the barometer as an altitudemeasuring device, they take it to the roof of the building and drop it off, timing its fall. One student reports a fall time of 2.0s, and the other, 2.3s. How much difference does the 0.3s make for the estima
0184 
Figure 243 shows the position vs, time graph for two bicycles, A and B (a) Is there any instant at which the two bicycles have the same velocity? (b) Which bicycle has the larger acceleration?(c) At which instant(s) are the bicycles passing each other? Which bicycles is passing the other? (d) Which bicycle has the highest instantaneous v
0908 
Huck Finn walks at a speed of 0.60 m/s across his raft (that is he walks perpendicular to the raft’s motion relative to the shore). The raft is traveling down the Mississippi River at a speed of 1.70 m/s relative to the river bank (Fig 338). What is Huck’s velocity (speed and direction) relative to the river bank?
0723 
You are driving south on a highway at 25m/sapprozimately 55mi/h) in a snowstorm, when you last stopped, you noticed that the snow was coming down vertically, but it is passing the windows of the moving car at an angle of 30o to the horizontal. Estimate the speed of the snowflakes relative to the car and relative to the ground.
0179 
A boat can travel 2.30m/s in still water.(a) if the boat points its prow directly across a stream whose current is 1.20m/s, what is the velocity (magnitude and direction) of the boat relative to the shore? (b) What will be the position of the boat, relative to its point of origin after 3.00s? (see Fig. 330).
0414 
Two planes approach each other headon. Each has a speed of 785 km/h, and they spot each other when they are initially 11.0km apart, how much time do the pilots have to take evasive action?
0251 
And airplane is heading due south at a speed of 600km/h. If a wind begins blowing from the southwest at a speed of 100 km/h (average), calculate:(a) The velocity (magnitude and direction) of the plane relative to the ground, and \(b) How far from its intended position will it be after 10 min if the pilot takes no corrective action.
0135 
And airplane is heading due south at a speed of 600km/h. If a wind begins blowing from the southwest at a speed of 100 km/h (average), calculate: (a) The velocity (magnitude and direction) of the plane relative to the ground, and. (b) How far from its intended position will it be after 10 min if the pilot takes no corrective action.
0134