Mechanics | Relativity Answers

Why is oil drop used in Millikan's oil drop experiment instead of water drop?

A car and a truck start from rest at the same instant, with the car initially at some distance behind the truck. The truck has a constant acceleration of 2.10m/s2 , and the car an acceleration of 3.31m/s2 . The car overtakes the truck after the truck has moved a distance 49.0m .
a.How much time does it take the car to overtake the truck?
b.How far was the car behind the truck initially?
c.What is the speed of the truck when they are abreast?
d.What is the speed of the car when they are abreast?

Kaitlin is going off to her physics class, jogging down the sidewalk at a speed of 4.10m/s . Her husband Scott suddenly realises that she left in such a hurry that she forgot her sandwich, so he runs to the window of their apartment, which is a height 40.7m above the street level and directly above the footpath, to throw it to her. Scott throws it horizontally at a time 5.50s after Kaitlin has passed below the window, and she catches it on the run. You can ignore air resistance.

a.With what initial speed must Scott throw the sandwich so Kaitlin can catch it just before it hits the ground?
b.Where is Kaitlin when she catches the sandwich?

In U.S. football, after a touchdown the team has the opportunity to earn one more point by kicking the ball over the bar between the goal posts. The bar is 3.00 m above the ground, and the ball is kicked from ground level, 11.0 m horizontally from the bar
If the ball is kicked at 44.0∘ above the horizontal, what must its initial speed be if it to just clear the bar? Express your answer in m/s.

i need the mass and density of a sphere made of solid glass with a 32 cm circumference.

A particle moving in a straight line path covers half of the total distance at speed of 3m/s the other half distance is covered in two half equal intervals of time with speed 4.5m/s and 7.5m/s .Find the average speed of this particle

Suppose we are told the acceleration of a particle moving in a circle of a radius r with uniform speed v is proportional to some power of r say n, some power of v, say m. Determine the powers of r and v?

the minute hand of a clock is 10 cm long .find its displacement and the distance covered from 10 am to 10:30 am

a cyclist and their bike have a combined mass of 94kg and a kinetic energy of 2303J. what is the speed of the cyclist?

for a body travelling with a uniform acceleration, its final velocity is v=√(180-7x), where x is the distance travelled by the body then acceleration is