Recent content by jgray

Linear Momentum question - help please Homework Statement A 15,000 kg loader traveling east at 20 km/h turns south and travels at 25 km/h. Calculate the change in the loader’s kinetic energy. linear momentum. Homework Equations KE2-KE1 = change in KE p=mv The Attempt at a Solution a...

Homework Statement A block of mass 2.5 kg is placed against a compressed spring (k = 2900 N/m) at the bottom of an inclined plane (angle = 28 degrees). When the spring is released the block is projected up the incline and the spring expands by 14 cm to its normal length. a.Calculate the...

Thanks for the help! :)

Hmm, maybe I do have an error in my first part then. I found the centripetal force: T1x+T2x = sin θ(T1) + sin θ(T2)= sin53(18N) + sin53(8.2N) --8.2 N is the answer i found for the second tension force for part 1-- 14.37+6.55 20.92N For the velocity: v^2= Fr(r)/m (20.92N)(0.4m)/0.6kg=...

Homework Statement A 0.60 kg sphere rotates around a vertical shaft supported by two strings, as shown. If the tension in the upper string is 18 N. Calculate the tension in the lower string? the rotation rate (in rev/min) of the system? Homework Equations v=2(pi)r/T Fr= mv^2/r ω =...

Homework Statement A 4.0 kg toboggan rests on a frictionless icy surface, and a 2.0 kg block rests on top of the toboggan. The coefficient of static friction μs between the block and the surface of the toboggan is 0.58, whereas the kinetic friction coefficient is 0.48. The block is pulled by...

Okay I see what you guys mean about the force being parallel versus horizontal . So instead, I break the Fapplied into x and y components. Since my Fnet of x is 0 d/t no acceleration, my Fgx should be equal and opposite to Fax.. So 414N I think. Then I used cos28Fax to find the applied force, so...

Homework Statement A 90 kg box is pushed by a horizontal force F at constant speed up a ramp inclined at 28°, as shown. Determine the magnitude of the applied force. when the ramp is frictionless. when the coefficient of kinetic friction is 0.18. Homework Equations Ff= uk(Fn) The...

sorry I don't really know what that means though

Homework Statement An object of mass m = 2.3±0.1 kg is moving at a speed of v = 1.25±0.03 m/s. Calculate the kinetic energy (K = 1 mv2) of the object. What is the uncertainty in K? Homework Equations k=1/2mv^2 The Attempt at a Solution I have figured out that the kinetic energy...