Mechanics | Relativity Answers

In baseball, when a pitcher throws a ball, at what point does it reach it's fastest speed? Is it the instant it leaves his hand? Or is it some other point?

A 2000 kg car is traveling on a banked curved icy road without sliding. The velocity of the car is 30 m/s and the road is banked at an angle of 20 degrees. What is the radius of curvature of the road?

I really need to know HOW to do it... not just the answer

Acceleration is always in the direction:
a. of the displacement
b. of the initial velocity
c. of the final velocity
d. of the net force
e. opposite to frictional force

Lori, who loves to ski, has rigged up a rope tow to pull herself up a local hill that is inclined at an angle of 30.0 degrees from the horizontal. The motor works against a retarding frictional force of 100 N. If Lori has a mass of 68.5 kg, and the power of the motor is 1350 W, at what speed can the motor pull her up the hill? Please answer in meters per second (m/s).

A tank is 0.5m deep and its full of water. Calculate the pressure at the bottom of the tank due to the liquid.

A rubber pad acts as an elastic spring.when a mass of 150g is placed on it a compression of 1.5cm is produced.
The spring mass system begins to oscillate when the mass is gently tapped downwards.
Calculate the frequency of oscillation.

A projectile is fired uphill over ground with slope at an angle alpha to the horizontal. find the direstion in which it should be aimed to achieve the maximum range?

What do you understand by centrifugal force and Coriolis force? A bacteria of mass 2*10^-24kg is rotated in a centrifuge at an angular speed of 4*pi*10^3 rad/s. It is situated at a distance of 5 cm from the axis of rotation. Calculate the effective value of g relative to the rotating frame of reference and the net centrifugal force on the bacteria.

A projectile is fired uphill over ground with slope at an angle alpha to the horizontal. find the direstion in which it should be aimed to achieve the maximum range?

Consider a system of three equal mass particles moving in space; their positions are given by .
For particle 1, a1=3t^2+4,b1=0,c1=0
For particle 2, a2=7t+5,b2=0,c2=4
For particle 3, a3=2t,b3=3t+4,c3=t^2
Determine the position and velocity of the centre of mass as functions of time.