Physics Answers

Calculate the increase in length when 1000.0cm of steel wire of linear expansitivity 1.2×10-5°c is heated from 0°c to 50°c

In a magnetic field of 8x10^-4 T oriented south, a 3.21x10^-6 C flows east at a velocity of

4x10^6 m/s. How strong is the magnetic force operating on the charge?

A 0.5kg egg is falling at a speed of 10 m/s before hitting the ground. What is the force of impact if the impact time is measured to be 3.0 milliseconds?

As you are analyzing a spherical mirror situation, you write an equation that states: 1/f=1/+12cm+1/+24cm. What is the value of 1/f? What is f?

A 5.0kg mass has its velocity change 8 m/s to 2 m/s east. Find thee objects change in momentum

A military aircraft flying at an altitude of 1,000 m has launched a glide missile. If the missile landed 100m from the launch point, how fast was the aircraft flying?

A boulder rolls off a 100m high cliff at a speed of 5m/s. How long will it take for the boulder to hit the ground? How far from the base of the cliff will the boulder land?

What will be the change in internal energy of a system that absorbs 300 J of heat and performs 500 J of work?

Calculate the change in internal energy, 400 J of work is done on the system and the system losses 225 J of heat energy.

 A mule is pulled by ropes with forces of 100

lbs. in a direction 30° north of west and 100 lbs. in a direction 37° south of

west. Estimate the resultant force on the mule.

Tension is maintained in a string of 29.0 N and transverse wave is observed to pass with a speed of 27.0 m/s. (a) What linear mass density this string has? (b) If the tension is reduced half of its initial value, what speed will a transverse wave can be propagated through the string?