Recent content by ScienceGirl90

Homework Statement Two 4.40 kg blocks of negligible size are attached to the middle and end of a thin, massless, wire that is 260 cm long. The blocks are rotating horizontally on a frictionless horizontal surface. The free-end of the wire is attached to a pivot, and the system is rotated in...

Oh ok! So then 78 rotations is the distance then?

Homework Statement A medical laboratory centrifuge is rotating at 377 rad/s (3600 rpm). When it is switched off, it rotates 78 times before it comes to rest. Assuming constant angular deceleration, what is the angular deceleration? Homework Equations w=at+w(initial) The Attempt at...

Homework Statement Given a bicycle that is moving at a constant speed of 15.6 m/s with a wheel radius of .32 m... A. How long will it take the wheel to rotate 19 times? B. What angle in radians will the wheel rotate in 2.33 minutes? Homework Equations theta=angular velocity*time...

Homework Statement A 45.0 kg barrel is raised 6.60 m (from rest) by cable that exerts 710 N on the barrel. Neglecting any frictional energy losses, how much work is done against gravity to lift the barrel and what is the net work done on the barrel? Homework Equations W=m*g*h W=F*D...

Ok, thank you. Would you mind explaining how I get 105 m/s every minute to m/s for acceleration?

Homework Statement A 2500 kg car starts from rest and travels along a circular track with a radius of 55.0 meters. The car starts out at a position due East of the center of the track, heading due North initially around the track, which is counterclockwise. The car increases its speed by 105...

Well I did read that if you know the direction of acceleration, you know the direction of the net force. But I am still confused as to how this helps. Would you please explain more? Thank you!

Homework Statement Find the magnitude of net force on the following object a 725 gram block that is accelerating at 8.10 m/s2 at an angle of 18.0 degree relative to horizontal. Homework Equations F=m*a The Attempt at a Solution I first converted the 725 grams to kilograms but then...

Hm okay. I'm sorry I didn't clearly state the question. The original question asks, "Find the magnitude of net force (i.e. the sum total of all the forces) on the following object: A 725 gram block that is accelerating at 5.10 m/s2 at an angle of 14.0 degree relative to horizontal.

How do you find magnitude of net force given mass, angle, and acceleration? I have a mass of 725 kg, an acceleration of 5.10 m/s squared and an angle of 14.0 degrees. The only equation I'm given is F=M*A but I don't know how to apply it when I have an angle as well.

Homework Statement A ball is thrown horizontally from the top of a building 70.0 m high. The ball strikes the ground 90.0 m from the base of the building (Neglecting air resistance). How fast and at what angle (relative to horizontal) does the ball strike the ground? Homework...

Would that be the d=1/2(vf+vi)t ? I wasn't given that equation on my handout but I looked it up.

Homework Statement An 9.30 kg body moving at 9.30 m/s begins to decelerates uniformly. After 9.30 s the body is 9.30 m from the location were it started to decelerate. What is the final speed of the body 9.30 s after it started to decelerate? Homework Equations I'm not sure what...

Oh I see! Thank you very much!