Question

A juggler is performing an act by juggling several balls. The juggler throws the balls up at an initial height of 3.9 feet with a speed of 14.8 feet per second. If the juggler did not catch a ball, about how long will it take the ball to hit the floor?

a) 1.45 secs

b) 1.14 secs

c) 0.28 secs

d) 0.21 secs

Answer 1

I only know SI units, so this may be wrong
but the problem is v = u +at where a is negative gravity
so 0 = 14.8 - 32.174 t
so t = 0.46 seconds.

so how high did it get?
s = ut +1/2 at^2
s = 14.8(0.46) +0.5 * -32.174*0.46^2
s = 3.4
so It started at 3.9 feet and went another 3.4 so total height is 7.3
s = ut +1/2 at^2
7.3 = 0 + 0.5 *32.174 *t^2
t = 0.67
so total t = 0.46 +0.67 = 1.13 seconds

Answer 2

can u answer this diarmuid wrenne
Explain at a molecular level what happens during latent heat of fusion or evaporation

Answer 3

sorry. I'm not much good at the theory stuff!!