Recent content by aaronb

Homework Statement Two loudspeakers are placed on a wall 1.00 m apart. A listener stands 4.00 m from the wall directly in front of one of the speakers. A single oscillator is driving the speakers at a frequency of 800 Hz. (a) What is the phase difference between the two waves when they...

It is there to confuse. The net torque turned out to be -2.96 so the 12N force is tangential. Thanks for bringing that up to attention

Me niether, do you think it was put there to confuse?

Homework Statement find the net torque on the wheel about the axle through O, taking a = 7.00cm and b = 20.00cm. Assume the positive direction is counterclockwise Homework Equations torque = force x distance torque = force x (radius x sin(phi)) The Attempt at a Solution 10.0 x .2m...

Thanks for the link LowlyPion it helped me a lot.

Homework Statement A dentist's drill starts from rest. After 3.30 s of constant angular acceleration, it turns at a rate of 2.52 multiplied by 104 rev/min. Find the drill's angular acceleration. Determine the angle through which the drill rotates during this period Homework Equations...

Homework Statement The subject lies on a horizontal pallet floating on a film of air. Friction on the pallet is negligible. Initially, the momentum of the system is zero. When the heart beats, it expels a mass m of blood into the aorta with speed v, and the body and platform move in the...

since the archer is moving -0.37m/s should I multiply that by the mass of the archer so I get momentum on the right side of the equation? The velocity of the first arrow is 54.8 m/s

Homework Statement A 68.6 kg archer stands at rest on frictionless ice and fires a 0.46 kg arrow horizontally. He fires and slides back -0.37m/s. He fires another arrow while he is still sliding that is going 76m/s. What will be his velocity after he fires the second arrow?Homework Equations...

Homework Statement A fully charged 15.0 kg lead-acid battery can deliver power 1450 W for 1.0 hr. (For comparison, the "heat of combustion" of gasoline is about 44 MJ/kg.) Battery _____ MJ/kg Homework Equations Unit conversion problem 1W = 1 J/s The Attempt at a Solution (1450 J/s...

Homework Statement A fully charged 15.0 kg lead-acid battery can deliver power 1450 W for 1.0 hr. (For comparison, the "heat of combustion" of gasoline is about 44 MJ/kg.) Battery _____ MJ/kg Homework Equations Unit conversion problem 1W = 1 J/s The Attempt at a Solution (1450 J/s...

Homework Statement A fully charged 15.0 kg lead-acid battery can deliver power 1450 W for 1.0 hr. (For comparison, the "heat of combustion" of gasoline is about 44 MJ/kg.) Battery _____ MJ/kg Homework Equations Unit conversion problem 1W = 1 J/s The Attempt at a Solution (1450 J/s...

Homework Statement A 180 N child is in a swing that is attached to ropes 1.80 m long. Find the gravitational potential energy of the child-Earth system relative to the child's lowest position at the following times. (a) when the ropes are horizontal Homework Equations Kf+Ugf=Ki+U[SUB]gi[SUB]...

Ignore that released from rest part.

Homework Statement A ball of mass m = 8 kg is dropped from rest at a height h = 13.9 m above the ground. Ignore air resistance. (a)If the ball is being released with a downward speed 4.9 m/s initially, what will be its final speed when it hits the table 0.7 m below the release point? (b)...