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A ball is projected upward at time = 0.0 s, from a point on a roof 30 m above the ground. The ball rises, then falls and strikes the ground. The initial velocity of the ball is Consider all quantities as positive in the upward direction. The average velocity of the ball, during the first is closest to.
A closed cylindrical tank has a height of 0.71 m. The tank is initially filled with air at a pressure of 2.0 atm. Water is pumped into the tank until the air pressure reaches 4.0 atm. The temperature is constant. Determine the height of the compressed air.
compute the tension in a string that whirls a 2kg toy in a horizontal circle of radius 2.5m when it moves at 3m/s
A 18.0 kg loudspeaker is suspended 2.40m below the ceiling by two 4.10m long cables that angle outward at equal angles. What is the tension of each of the cables.
what would the image distance be (pay attention to sign)? cm d. Could the new image be projected on a screen?
A plane touches down for a landing with a ground speed of 120 mi/h (53.7 m/s). The runway is 1000 m in length and the plane stops at the end of the runway after slowing down with constant acceleration. What is the plane's acceleration while stoppi..
What is the size of the smallest vertical plane mirror in which a 10 tall giraffe standing erect can see her full-length image? (Hint: Locate the image by drawing a number of rays from giraffe's body that reflect off the mirror and go to her eye.
Two adjacent natural frequencies of an organ pipe are determined to be 299 Hz and 345 Hz. (Suppose the speed of sound is 343 m/s.)
what is meant by 'net charge a. the total amount of positive charge of an object b. the total amount of negative charge on an object c. the total amount of neutral charge on an object d. A minus B
A 79 kg person sits on a 3.7 kg chair. Each leg of the chair makes contact with the floor in a circle that is 1.3 cm in diameter. Find out the pressure exerted on the floor by each leg of the chair, suppose the weight is evenly distributed.
A jeweler working awith a heated 47 g gold ring must lower the ring's temperature to make it safe to handle. If the ring is initially at 99 C, what mass of water at 25 C is needed to lower the rings temperature to 38 c.
Billy has a bucket that has a mass of 150 g, in which he put 150 g of fresh water. He has tied 150-cm of string to the handle of the bucket.
What is the radius of the pen. How far should it now sail to reach its original destination.
Electric field lines from a charged flat plate in air to the parallel flat plate with the opposite charge (a dc capacitor). Within this space, small (compared to the size of the plates) rectangles of non -conducting and conducting materials.
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