Recent content by CaptFormal

Homework Statement The position of an object along a straight tunnel as a function of time is plotted below: 1. Are there any time intervals in which the object has a negative acceleration? If so, list them and explain how you know. 2. Calculate the instantaneous velocity at t=20s...

Homework Statement An object goes from one point in space to another. After it arrives at its destination, its displacement is _________________ than the distance it traveled. A) either greater than or equal to B) always greater than C) always equal to D) either smaller than or equal to...

I don't know. How would you go about solving for it?

Homework Statement The mass of the tray itself is 0.187 kg, and its center of gravity is located at its geometrical center. On the tray is a 1.31 kg plate of food and a 0.300 kg cup of coffee. Assume L1 = 0.0610 m, L2 = 0.130 m, L3 = 0.224 m, L4 = 0.365 m and L5 = 0.387 m. Obtain the...

Homework Statement A figure skater during her finale can increase her rotation rate from an initial rate of 1.14 revolutions every 1.86 s to a final rate of 3.13 revolutions per second. If her initial moment of inertia was 4.46 kg*m2, what is her final moment of inertia? Homework...

So, what do I do with this value: Icm=(2/3)mr^2? I am sure that it plays a part in solving for the solution.

Homework Statement A wheel of radius R = 30.0 cm is mounted on a frictionless horizontal axis. A massless cord is wrapped around the wheel and attached to a 4.75-kg crate that slides on a frictionless surface inclined at an angle of 25.0° with the horizontal. The crate accelerates down the...

Homework Statement When jumping straight down, you can be seriously injured if you land stiff-legged. One way to avoid injury is to bend your knees upon landing to reduce the force of the impact. A 72.6 kg man just before contact with the ground has a speed of 6.35 m/s. In a stiff-legged...

Homework Statement (a) Copper has a breaking stress of about 3.00×108 N/m2. What is the maximum load that can be hung from a copper wire of diameter 0.37 mm? (b) If 17 percent of this maximum load is hung from the copper wire, by what fraction of its original length will it stretch? Homework...

Homework Statement A toddler is having fun rolling a ball down a slide of height h=4 m. The ball can be considered as a thin spherical shell, Icm=(2/3)mr^2, with m being its mass and r being its radius. What is the velocity of the ball at the bottom of the slide...

Homework Statement A bullet with a mass of 6.30 g is fired horizontally at two blocks resting on a smooth and frictionless table top as shown in the Figure. The bullet passes through the first 1.95 kg block, and embeds itself in a second 2.00 kg block. Speeds v1 = 2.50 m/s and v2 = 3.40 m/s...

Homework Statement A block of a certain material begins to slide on an inclined plane when the plane is inclined to an angle of 12.95°. If a solid cyclinder is fashioned from the same material, what will be the maximum angle at which it will roll without slipping on the plane? Homework...

Homework Statement A rod of length 69.0 cm and mass 1.70 kg is suspended by two strings which are 43.0 cm long, one at each end of the rod. http://schubert.tmcc.edu/res/msu/physicslib/msuphysicslib/20_Rot2_E_Trq_Accel/graphics/prob13a_1016full.gif (A) The string on side B is cut. Find...

Ok, so here is what I got so far. Vx = 21cos(48) - 16cos(67) = 7.8 Vy = 21sin(48) - 16sin(67) = 0.8779 Now I am not sure what to do. I tried the following: (7.8^2 + 0.8779^2)^(1/2) and then took that answer and multiplied it by the mass but it was incorrect. What am I missing?

Homework Statement A billiard ball of mass m = 0.15 kg strikes the cushion of a billiard table at θ1 = 48° and a speed v1 = 21 m/s. It bounces off at an angle of θ2 = 670 and a velocity of v2 = 16 m/s. What is the magnitude of its change in momentum (in kg·m/s)...