Recent content by jehan4141

It is definitely not a matter of significant figures. Even when I tried your suggestion I still get very close to my original answer. Can anybody else please confirm if this thought process is at least correct? Thank you again.

A student typing in a computer cluster generates a sound level of 55 dB. What will the dB level the night before essays are due when there are 30 equally noisy students working in the cluster? dBo = 55 Ihearing = 1E-12 W/m2 Bo = 10log(I/Ihearing) 55 = 10log(I/Ihearing) 55 =...

This is just a concept question. Say you have a spring arranged vertically with an object on the end of it. The spring is compressed.. At some point you, the system is released from compression. When calculating the velocity at which the object loses contact, I understand that you use the...

Thank you! yes I did miss a decimal point. thank you!

Would I just add the two moment of inertia together? IF = 0.14 +[0.39(0.222)] IF ~ 0.158876 WoIo = WFIF WoIo / IF = WF WF = 0.047(0.14) / 0.158876 WF ~ 0.414?

A solid disk rotates in the horizontal plane at an angular velocity of 0.047 rad/s with respect to an axis perpendicular to the disk at its center. The moment of inertia of the disk is 0.14 kg·m2. From above, sand is dropped straight down onto this rotating disk, so that a thin uniform ring of...

that is the weirdest thing. i think i calculated that about 4 times before getting frustrated and posting here. thank you so much!

The radius of each wheel on a bicycle is 0.400 m. The bicycle travels a distance of 3.0 km. Assuming that the wheels do not slip, how many revolutions does each wheel make? This problem seems so simple but none of the possible answers available seems correct. My work r = 0.4 m x = 3...

OHHHH okay oh my...i haven't done 2-d kinematics in a few weeks. thank you i got it. :)

Voy = Vo(sin30) Vox = Vox(cos30) I know that the horizontal component doesn't change but that the vertical component does because of gravity...that doesn't help much...? i don't have enough known values.

A golf ball mass of 4.7 x 10-2 kg is hit by Tiger Woods and drops exactly into a hole 100 meters away. It is observed that the angle between the initial velocity vector and the horizontal plane is 30 degrees. What is the magnitude of the initial velocity? Isn't the problem missing...

The drawing shows a collision between two pucks on an air-hockey table. Puck A has a mass of 0.0480 kg and is moving along the x-axis with a velocity of +7.76 m/s. It makes a collision with puck B, which has a mass of 0.0960 kg and is initially at rest. The collision is not head-on. After the...

A 2.1-kg cart is rolling along a frictionless, horizontal track towards a 1.4-kg cart that is held initially at rest. The carts are loaded with strong magnets that cause them to attract one another. Thus, the speed of each cart increases. At a certain instant before the carts collide, the first...

Oh my goodness! Your eyes are so good! I have been using energy formulas all day that do Xf-Xi all day! Such a silly mistake thank you so much! it is so late and my brain if frazzled :)

A 3.5x107 kg ship is traveling at 7 m/s. The ship is accelerated forward with a F of 4.5 x 105 N over a distance of 2 km. What is the final speed? Vf = 10 m/s How long does it take the ship to traverse the 2 km? T = 233.33 seconds What is the average power which the engines had to...