Physics Answers

A man pulls a box with a force of 70N along the positive y axis, while a boy pulls it with a force of 50N, making an angle of 80° counter clockwise with the positive y axis. In what direction will the second boy apply a force of 60N so that the box will move in the positive y axis

1.   If three identical lamps are connected in series to a 6-V battery, what is the voltage drop across each lamp?

A helicopter pilot throws a ball downwards from an unknown height above the ground. The ball has an initial speed of 14.1 m/s. The ball hits the ground 9.2 s later. Find the initial height of the ball above the ground

how many isotopes does carbon have?

A trolley,mass 5kg moves at 4m.s east across a frictionless horizontal surface. A brick of mass 1.5kg is dropped onto the trolley . Calculate the change in momentum of the 5kg trolley

 What atom consitutes the molecule?

 What atom consitutes the molecule? how many carbon atoms?

How many electrons, protons, and neutrons do the buckminsterfullerene have.

The bone breaks if stress greater than 1.50 x 10 8 N/m 2 is imposed on it. (a) What is the

maximum force that can be exerted on the male humerus in the upper arms if it has a

minimum effective diameter of 5.87 cm? (b) If this much force is applied, by how much

does the 27.0-cm-long humerus stretched? Assume Young’s modulus for bone is 1.50 x

10 10 Pa.

How a circularly polarized light can be changed into plane polarized light

A 100g sample of Aluminum ( C= 0.90J/gC)at 120°C and a 150g sample of Iron metal (C=0.45J/C)at 90°C were placed in a container of 80g of water at 15°C. What is the final temperature of the mixture?

Can you show me the solution?