uno
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Hello,
I have been working on the following problems for hours and can't figure out where to begin. Any advice would be greatly appreciated.
-uno
1. An arrow is launched vertically upward from a crossbow at 97.9 m/s. Ignoring air friction, what is its instantaneous speed at the end of 10.0 s of flight?
(I figured out the instantaneous speed at -.2 m/s) A second part of the question asked for magnitude of instantaneous acceleration.
2. A raw egg is thrown horizontally straight out of the open window of a fraternity house. If its initial speed is 18 m/s and it hits ground 2.1 s later, at what height was it launched? At such low speeds air friction is negligible. [Hint: Even though it's been thrown horizontally, the egg falls vertically for 2.1 s exactly as if it were simply dropped.]
3. While rolling marbles on a horizontal window sill a youngster accidentally shoots one at 2.6 m/s out the open window. He sees it land in a flower pot on a neighbor's firescape 2.8 s later. How far beneath the sill is the pot?
4. Suppose you point a rifle horizontally directly at the center of a paper target 97 m away from you. If the muzzle speed of the bullet is 1020 m/s, where will it strike the target? Assume aerodynamic effects are negligible.
Thanks.
I have been working on the following problems for hours and can't figure out where to begin. Any advice would be greatly appreciated.
-uno
1. An arrow is launched vertically upward from a crossbow at 97.9 m/s. Ignoring air friction, what is its instantaneous speed at the end of 10.0 s of flight?
(I figured out the instantaneous speed at -.2 m/s) A second part of the question asked for magnitude of instantaneous acceleration.
2. A raw egg is thrown horizontally straight out of the open window of a fraternity house. If its initial speed is 18 m/s and it hits ground 2.1 s later, at what height was it launched? At such low speeds air friction is negligible. [Hint: Even though it's been thrown horizontally, the egg falls vertically for 2.1 s exactly as if it were simply dropped.]
3. While rolling marbles on a horizontal window sill a youngster accidentally shoots one at 2.6 m/s out the open window. He sees it land in a flower pot on a neighbor's firescape 2.8 s later. How far beneath the sill is the pot?
4. Suppose you point a rifle horizontally directly at the center of a paper target 97 m away from you. If the muzzle speed of the bullet is 1020 m/s, where will it strike the target? Assume aerodynamic effects are negligible.
Thanks.