Physics

Suppose the river is flowing east at 2.80 m/s and boat is traveling south at 3.70 m/s with respect to river

I got the speed to be 4.64 and the direction to be 37.1 degrees south of east. But i know for sure the direction is wrong. Can someone please help with that? thank you :)-soh cah toa You messed up yo

Why can we see light from the beginning of the universe

If the universe spontaneously came into existence, a big bang, all from a singularity, and all the matter is moving outwards from this point, and nothing can travel faster than light, so the first lig

Question about mechanics, acceleration with friction

Sorry if i sound a bit vague, currently watching a film :) So for example if you have two connected particles, one on a slope with friction, the other dangling down, you use f=ma to work out the over

What are black-hole atoms

science news magazine ron cowen-Black-hole atoms Instead of evaporating, mini–black holes created during the Big Bang may survive and trap nearby particles into stable orbits, forming the gravitationa

Vf^2 = Vi + 2ax. But does Vf^2 = Vi + 2ay

Hi! Im trying to solve a projectile motion question, so I want to know: Since projectile motion is divided in X and Y components, does that mean I can swap x for y in equations when Im solving for th

Why are mushroom clouds (atomic) so similar to mushrooms (fungi)

The simularities between some mushroom development (when sped up on film) and the development of an atomic mushroom cloud are striking.Can somebody explain why they are the similar - preferably in ter

A coild with 209 turns of wire, a total resistance of 26 Ω, and a cross sectional area of 0.25 m2 is positione

A coild with 209 turns of wire, a total resistance of 26 Ω, and a cross sectional area of 0.25 m2 is positioned with its plane perpendicular to the field of a powerful electromagnet. What average curr

Physics helps plsease

A projectile,red with unknown initial velocity, lands 22:0 s later on the side of a hill, 3270 m away horizontally and 445 m vertically above its starting point. (Ignore any eects due to air resistan

How do you work out Kinetic Energy without being given Velocity (Mechanical Principles)

I need to work out the kinetic energy of an object being pulled along a flat bench. I know KE = 1/2 MV^2 But Im not given Velocity these are the factors I have already. Distance Traveled = 4M Force =

Rotation and speed problem

A lift travellig at a constant speed of 50km/hour has a winding drum for the lift cable which rotates at 105rpm what is the diameter of the winding drum?-A lift traveling at a constant speed of 50km/h

Describe one situation where you would consider thermal energy as useful energy and one as wasted energy

Please help me.-Heating your house in winter is - for most of us - useful. The heat produced by your car in summer is wasted.-I will give you two examples that involve the same energy source so you c

Acceleration can be summed up simply as

A. how fast you are going. B. how fast your velocity is changing.-B. Keep in mind that velocity is a vector composed of a speed and its direction.You can change either or both and have an acceleration

What kind of energy does a roller coaster train have when it's stopped

It has potential energy as its going up a hill and on top of it, and that changes into kinetic energy as the train gains speed, but what kind of energy does it have after the ride is over when its sto

In which year Einstein made general relativity

1905 AD-1915 Abir Laskir is a cretin

Number of Photons Emitted Per Second

The predominant wavelength emitted by an ultraviolet lamp is 248 nm. If the total power emitted at this wavelength is 14.0 W, how many photons are emitted per second? Thank you in advance if you can