How many centimeters long is the proverbial \"10-foot pole?\" A piece of metal h

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How many centimeters long is the proverbial "10-foot pole?" A piece of metal has a mass of 85 cg and a volume of 450L. What is its density in g/cm3? What would be the mass of 300 cm3of this metal? What would be the volume of 200 ounces of this metal? A flower pot is dropped out a twentieth story window. How fast will it be moving after 7 seconds? How much is the acceleration 3 seconds after it falls? A symmetric projectile spends a total of 20 seconds in the air. It reaches a peak height of 8 meters. How long does it take to reach its peak height? The projectile has a range of 80 meters. What is its horizontal velocity? What is the projectile's horizontal acceleration? What is the projectile's vertical acceleration? If a car traveled at an average speed of 80 kilometers per hour for twenty minutes, and then slowed to an average speed of SO kilometers per hour over the next 15 minutes. How far would it travel In total? You throw a ball horizontally off of a building with a horizontal velocity of 10 m/s. What is the ball's horizontal velocity 5 seconds later? What is the ball's vertical velocity 5 seconds later? A satellite that is 4175 miles from the center of the earth, orbits with a period of 90 minutes. What is its centripetal acceleration? Use the scientific method to investigate a simple problem/question of your choice. The steps are listed in the lecture notes. Give an example that shows that the number part of distance and the number part of displacement can be different for the same motion. Give an example that shows that the number part of distance and the number part of displacement can be the same for the same motion. You fire a bullet from a height of 50m with a horizontal velocity of 50 m/s to the right. At the same instant you drop the same kind of bullet from a height of 50m Which bullet will hit the ground first? Ignore air resistance. Explain your answer

Explanation / Answer

6. there is no acceleration in horizontal direction..
hnce velocity in horizontal direction will be constant

vx = 10 m/s

In vertical,

a = - 9.8 m/s^2

using v = u + at in vertical direction,

v = 0 + (-9.8 x 5) = - 49 m/s

minus sign indicates direction. -> downward

9. a particle moving in circle.

particle comes back to the point again after completing one revolution.

so distance traveled = 2 pi R

displacement = 0

When particle moves in a staright line .

displacement is the distane traveled by object. (both are same)

10. object have to reach ground.

that means object have to travel 50m downwrads in vertical.

so In vertical,

initial vertical velocity, u = 0 for both of cases.

acceleration = - g for both case

y = -50 m for both

y =ut + at^2 /2

here y, u and a all three are same for both cases then t will also be same for both.

hence both bullet will reach ground at same time.

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