Linear Momentum

A billard ball approaches the rail at a speed of 15 m/s and an angle of 60 degrees, but rebounds at a speed of 10 m/s and an angle of 50 degrees. What is the change in momentum and use components?

Elastic and Inelastic collisions

A 10 gram bullet is fired horizontally into, and becomes embedded in a suspended block of wood whose mass is 0.890 kg. (a) How does the speed of the block with the embedded bullet immediately after the collision compare with the initial speed of the bullet? (b) If the block with the embedded bullet swings upward and its center ...continues

Center of Mass

A 3.0 kg rod of length 5.0 m has at opposite ends point masses of 4.0 kg and 6.0 kg(a) Will the center of mass of this system be (1) nearer to the 4.0 kg mass, (2) nearer to the 6.0 kg mass, or (3) at the center of the rod? Why? (b) Where is the center of mass of the system?

Rotational

Hi I need you help for two questions. Would you help me? 1- A professor steps onto a stationary turntable while holding a rotating bicycle wheel that is rotating with an angular velocity of 15 rad/s pointing upward. The wheels axis of rotation goes through the axis of the turntable. The rotational inertia of the wheel is 1.5 ...continues

Rotation: Tipping or sliding.

I have a 72" tall air-compressor that weights 120 pounds with a 20" base. I have a cart that is 36"wx72"l the surface of the cart where the compressor will be mounted is 10" off the ground. The cart wheels are in the corners, it is rated to carry 3600 pounds and weights 114 pounds. If the compressor is placed centered on the car ...continues

see attachement file

A hemispherical copper bowl- outer diameter 10cm, wall thickness lmm - is placed in a large bath of water. Will it float? If it does float, how far will the base of the bowl sink beneath the water surface? pic .....see attached file Note: Density of copper 8960 kgm-3 Finally perform a 'back of the envelope' calculatio ...continues

Air flow

In try to measure required duct air flow speed(m/s) for a room 3mx4.5x6m.The heating and airflow ducts to and from the room are circular .30m in diameter,the air flow needs to be changed every 12 minutes. How does the duct diameter fit in the problem? I assume 81m area of air fow would need to be changed every 720s(if meas ...continues

one dimention

An arrow is shot with a velocity of 45 m/s at an angle 50 degrees with the horizontal.What is the height of the arrow at a point 150 meters down range? I think I know how to get the TOTAL distance:45sin(50)(3.52)-.5x9.8x3.52=203.6M BUT NOT THE HEIGHT.

Carnot heat engine

I took at test yesterday that stated: The exhaust temperature of a carnot heat engine is 350 degrees C.What is the intake temperature if the efficiency is 25%? a)400C b)543C c)558C d)830C I contend it is neither!Should I protest the answer? I think C=1-Tc/Th is the right equasion

sound travel

a loudspeaker is placed between two observers who are 120m apartalong the line connecting them.if one observer records a sound level of 60dB and the other records a sound level of 90dB,how far is the speaker from each observer? I think the equasion is B2-B1=LOG(R1/R2) BUT I can not seem to come up with a sensable answer