Mechanics | Relativity Answers

There is a ladder 4m high which is placed against a wall with its foot at an angle of 30 degrees to the horizontal. calculate the force exerted by the wall on the ladder?There is a ladder 4m high which is placed against a wall with its foot at an angle of 30 degrees to the horizontal. calculate the force exerted by the wall on the ladder?

Mars has a Mass of about 6.4*10^23kg, & it's moon Phobos has a mass of about 9.6*10^15kg. If the magnitude of the gravitational force between the two bodies is 4.6*10^15N, at what speed does Phobos orbit Mars?

A massless frictionless pulley is held up by a single rope from the ceiling. Two 100 N weight hang from the sides of the pulley (balanced). Sketch a free-body diagram of the pulley, and determine the tension in the ropes.

A 224 kg crate is pushed horizontally with a force of 710 N. if the coefficient of friction is .25, calculate the acceleration of the crate.

when body placed on water,then how many part of body will come under the water?

what is the magnitude of momentum of a 22-g sparrow flying with a speed of 8.1m/s?

I'm 16 and I'm from Malaysia. Here, you only study Physics when you're my age. So, this is my first year studying it and I'm very interested in Physics as I wanted to be an astronomer and becoming one requires you to obtain an excellent grade in Physics.

So, we learned about base quantities and derived quantities, Scalar and Vector quantities today. As most of you know, the formula for 'Work' is 'force x acceleration'. Why is 'Work' is a Scalar quantity when both 'Force' and 'Acceleration' is a Vector quantity ? (Why when both these Vector quantities when multiplied becomes a Scalar quantity ?)

This may seems stupid for me to ask such basic question here on an expert physics website buy I'd appreciate your answers and help very much. Thank you! :)

what is the minimum work that has to be performed to bring a spaceship of mass 2000kg from the surface of earth to moon?

A bucket of mass 1.40 kg is whirled in a vertical circle of radius 1.10 m. At the lowest point of its motion the tension in the rope supporting the bucket is 25.0 N.
Find the speed of the bucket.
How fast must the bucket move at the top of the circle so that the rope does not go slack?

A 850N painter stands 1.2m from on end of a 3.0m scaffold supported at each end by a step ladder. The scaffold weighs 250N and there is a 40.0N paint can .50m from the end opposite the painter. How much force is exerted by each step ladder?