Mechanics | Relativity Answers

A square field measuring 100.0m by 100.0m has an area of 1.00 hectare.acre has an area of 43600ft².if a country lot has an area of 12.0 acres,what is the area in hectares

It may appear silly question to you but I seriously want to know it's ans please
The quest is
When we press our toe on floor remember toe not whole foot then our heels get moving up
Is it the normal reaction reaction force given by floor
But when force is exerted bu toe then how feet starts moving up

The relativistic mass of photon of wavelength 5, 0000A°
1)3.45×10^-36 kg
2)3.45×10^-35 kg
3)4.4×10^-35 kg
4)4.4×10^-36 kg

A sled slides down an icy slope starting at 6.14m/s. At the bottom of the slope, its speed is 12.5m/s. What is its minimum height (in m) of the slope? Why does this question ask for the minimal height of the slope?

A 3 kg block is moved up a 37 degrees incline under the action of a constant horizontal force of 40 N. The coefficient of kinetic friction is 0.1, and the block is displaced 2 meters up the inclined. Calculate (a) the work done by the 40 N force,(b) the work done by the gravity, (c) the work done by the friction, and (d) the changed in kinetic energy of the block

A 50 kg person launches themselves at a 65 kg box at a speed of 5.8 m/s. The force of friction between the box and the ground is 382 N. How far will the box move?

A builder lifts eight slabs from the ground on to the back of a lorry 1.5 m high.
The total time taken is 48 s and each slab weighs 200 N.
How much useful power does the builder produce?

A patient with a dislocated shoulder is put into a traction aparatus and .The pulls A and B have equal magnitudes and muat combine to produce an outward traction force of 5.60N on the patient arm.How large should these pulls be?

While following a treasure map,you start at an old oak tree,you first walk 825m directly south,then turn and walk 1.25km at 30.0degree west north,and finallay walk 1.00km at 40degree north of east,where you find the treasure:a biography of isaac newton.
(a)to return to the old oak tree,in what direction should you head and how far will you walk?use the components to solve this problem.
(b)to see whether your calculationin part (a) is reasonable,check it with a graphical solution drawn roughly to scale.