Physics Answers

A 100g ball and 200g ball are connected by a rod with a length of 60 cm. The mass of the rod is ignored. The axis of rotation is located at the center of the rod. What is the moment of inertia of the balls about axis of rotation?

In a seesaw, the person on the left weighs 900N and the person on the right weighs 400 N . If the person on the right is sitting 3 m from the fulcrum and the seesaw is balances, how far must the person on the left be from the fulcrum?

What is the largest current you would expect through a 15kΩ, 2.0% resistor when connected to a 5.0v supply? Give your answer in mA

A boy of mass 40kg runs up a flight of 30 steps each 150mm high in 6secs. Find the average power develop by the boy (take g=10m/s^2)

Assuming 2 objects, A & B, connected together, so sitting still in relationship to one another, then a force is applied to B causing it to accelerate through space away from A, and then the accelerating force is removed leaving B to continue away from A at a constant velocity.

Since we know that the accelerating force was applied to B, can we say that a clock in B, that had been initially synchronized with a clock in A, will tick slower than the clock in A, and would read, at some lapsed time, less than A?

And if the two objects returned to rest in regards to one another, (at some distance apart from each other) either by a reverse force being applied to B until it slows to a stop in regards to A, or a force being applied to A accelerating it in the direction of B until it reaches the velocity of B, can we say that the two clocks will again tick in unison but that the clock in B will read behind the clock in A?

Two blocks are free to slide along the frictionless wooden track shown below. The block of mass m₁ = 4.99 kg is released from the position shown, at height h = 5.00 m above the flat part of the track. Protruding from its front end is the north pole of a strong magnet, which repels the north pole of an identical magnet embedded in the back end of the block of mass m₂ = 10.5 kg, initially at rest. The two blocks never touch. Calculate the maximum height to which m₁ rises after the elastic collision.

What is the temperature change when 69, point, 0, k, J,

69.0kJ is transferred to a 1, point, 20, k, g,

1.20kg object with a specific heat capacity of 250, J, slash, left bracket, k, g, degrees, C, right bracket,

250J/(kg∘

C)?

A toy car slides straight off a 4.1 m high book shelf at a velocity of 2.8 m/s.

a) How long does it take for the toy car to hit the ground?

b) what is the range of the car?

Block A with mass m_A

mA

​ is placed on a horizontal surface S. Surface S is attached to a vertical axis. Block A is attached to this vertical axis via a massless rope. The distance between block A and the axis is R

R.

Between block A and surface S there is static friction with static friction coefficient \mu_{\rm s}

μs

​.

The whole system rotates around the axis of rotation (see figure) with angular frequency \omega=2\pi/T

ω=2π/T where T

T is the time of one revolution of rotation. The angular frequency \omega

ω is so large that the static friction force is maximum.

Calculate the tension in the rope.

all surfaces are smooth,pulleys and strings are ideal. Masses of each block is 1 kg. if aA, aB are the acceleration of block a and b respectively then the value of aA is?