Recent content by Cheddar

Wow, sorry if you read all that, but I didn't realize the teacher changed the EC question. We aren't doing that one anymore luckily.

Homework Statement A 0.01 kg bullet is fired horizontally into a 2.50 kg wooden block attached to one end of a massless, horizontal spring (spring constant = 845 N/m). The other end of the spring is fixed in place, and the spring is unstrained initially. The block rests on a horizontal...

Homework Statement A thin rod (length = 1.50 m) is oriented vertically, with its bottom end attached to the floor by means of a frictionless hinge. The mass of the rod may be ignored, compared to the mass of the object fixed to the top of the rod. The rod, starting from rest, tips over and...

Okay, so now I have: initial velocity (vertical) = 28.04 m/s time (to max height) = 2.86 sec y (max height) = 120.32 m horizontal displacement = 134.6 m So now I'm stuck on the part about the fielder catching the ball 0.914m above the level at which the ball was hit. I believe the...

Got it. Thank you.

I'm confused as to why the net horizontal force would be = mass * acceleration. Mass * acceleration = Weight, which acts in the vertical direction.

Can't figure out how...

I think I have it. 0.40 J/min

It is the velocity before the collision. If it is the velocity when it strikes the block then it is the final velocity in its own equation. Final velocity before impact and final velocity of the bullet/block combination are two differenct variables in two different equations.

So, instead of T(4th power) it should maybe be the difference between the ball's temp and the environments temp(to the 4th power)??

Thanks everyone. I was counting the opposite way I guess. There is no picture or explanation as to the numbering of the cars so I guess we really have no idea which answers are correct... I'm using the one with the first car being behind the engine though. I think it makes more since. Thanks again.

Homework Statement A 2.5 g bullet, traveling at a speed of 425 m/s, strikes the wooden block (mass = 215 g) of a ballistic pendulum. (A) Find the speed of the bullet/block combination immediately after the collision. (B) How high does the combination rise above its initial position...

Homework Statement A motorcycle (mass of cycle plus rider = 250 kg) is traveling at a steady speed of 20 m/s. The force of air resistance acting on the cycle and rider is 200 N. Find the power necessary to sustain this speed if (a) the road is level and (b) the road is sloped upward ar...

Homework Statement A fight jet is launched from an aircraft carrier with the aid of its own engines and a steam-powered catapult. The thrust of its engines is 230,000 N. In being launched from rest it moves through a distance of 87 m and has a kinetic energy of 45,000,000 J at lift-off. What...

Homework Statement A suitcase is on a sloped carousel (slope = 36degrees) with a radius of 11m and a constant speed. The suitcase has not slid all the way down the carousel.The coefficient of static friction between the suitcase and the carousel is 0.76. How much time is required for the...