Recent questions in Physics

Speed of kangaroo
A kangaroo is capable jumping two a height of 2.62m ditermint the take off speed of the kangaroo
what is the push force F?

A 50 kg crate is being pushed on a horizontal floor at constant velocity. Given that the coefficient of kinetic friction between crate and floor is $\mu$k = 0.1, what is the push force F?

What is the minimum angle theta so that the ladder doesn't slip?

A uniform ladder of length L is leaning against the side of a building, as shown. A person of mass m = 75 kg is standing on it. The mass of the ladder is M = 10 kg. The coefficient of static friction between the ground and ladder is $\mu$s1 = 0.5, and the coefficient of static friction between the wall and ladder is $\mu$s2 = 0.3. What is the minimum angle $\theta$ so that the ladder doesn't slip?

Determine the acceleration of the blocks.

Two blocks of mass m and M are hanging off a single pulley. Determine the acceleration of the blocks. Ignore the mass of the pulley.

The spring has a stiffness k. How much is the spring compressed?

A block of mass M falls onto a spring. Before colliding with the spring the velocity of the block is V. The spring has a stiffness k. How much is the spring compressed?

How much is the spring compressed?

A block of mass M is traveling on a surface inclined at angle $\theta$. The coefficient of kinetic friction is $\mu$ between block and surface. The velocity of the block is V before colliding with a spring. The spring has a stiffness k. How much is the spring compressed?

Using an energy analysis determine which person is correct.
Two people are at the gym having a debate about how much energy is required to bench press a certain weight for one repetition. One person says that the energy required depends on how fast the weight is lifted. The other person says that it doesn't matter. Using an energy analysis determine which person is correct.
What will be the force between two wires?

Two long straight wires carrying the same current I and separated by a distance r exert a force F on each other. The current is increased to 4I and the separation is reduced to r/6 .

How far away in meters is the next pressure maximum?
A saxophone is playing a steady note of frequency 266 Hz. The temperature in the room is 25 C. Suppose that at some instant the varying pressure at your eardrum is at a maximum.
What is its wavelength?
A sound wave traveling at 350 m/s has a frequency of 500 Hz.
What is the velocity of the arrow immediately after release?
An archer pulls back 0.75 m on a bow which has a stiffness of 200 N/m. The arrow weighs 50 g.
From these equations derive the equation for centripetal acceleration.

A particle is moving around in a circle and its position is given in polar coordinates as

x = Rcos(theta)

y = Rsin(theta)

, where R is the radius of the circle, and theta is in radians.