Physics Answers

A bus is moving at 5.0 m/s when a passenger walks forward at 1.5 m/s relative to the bus. How fast is this passenger moving as seen and measured by (a) a person waiting at the bus stop and (b) the driver of the bus?

Three 3.0ohms resistors are connected parallel. What is the equivalent resistance?

A projectile is fired in such away that its horizontal range is equal to its maximum height what is the angle of projection ?

A CD starts from rest and accelerates to an angular frequency of 3.5 rev/s. Calculate

the disc s average period T and centripetal velocity at the edge of the disc when

radius is 2. 0 x 10^-2m. 

The total electric motor of a model train accelerates the train from rest to 0.620 m/s in 21.0cs the total mass of the train is 875g find the average power delivered to the train during the accelerates

A large sled is located with rocks and sits at the top of a snowy slope as shown in the diagram below

the sled and Rock weigh a total of 1250kg the top of the slope is 100m away from the bottom and 12.0 m vertically higher than it

the sled is initially stationary and then begins to slide without friction down the incline at what speed will the sled be travelling when it reaches the bottom of the slope in ms-1

A 12 volt battery is connected a light bulb and draws 150mA of current. What is the electrical resistance of a light bulb. How much power does it consume. How much will it cost to operate this bulb for a month,if the cost of electricity is $0.11 per kilo watt

The velocity of a particle is v=v0[1-sin(xt/T)]. Knowing that the particle starts from the origin with an initial velocity vo, determine (a) its position and its acceleration at t = 3T, (b) its average velocity during the interval t = 0 to t = T.

How much work is needed to move a −9.5 charge from ground to a point whose potential is +75 V.