Recent content by itsmarasilly

Homework Statement A mass spectrometer analyzes and gives data for a beam of doubly ionized atoms. The values are q = 2(1.60 x 10^-19 C), B = 5.0 x 10^-2 T, r = 0.120 m, and V = 3442.9 V. Find the mass of one of these atoms. Homework Equations B^2*q*r^2 / 2*v The Attempt at a...

Homework Statement A wire carrying 15 A of current has a length of 17 cm in a magnetic field of 0.80 T. The force on a current-carrying wire in a uniform magnetic field can be found using the equation F = BIL sin θ. Find the force on the wire for each of the following angles between the wire...

Homework Statement Three 16 ohm resistors are connected in parallel and placed across a 34 V battery. (a) What is the equivalent resistance of the parallel circuit? (b) What is the current delivered by the battery? Homework Equations (a) (1/equivalent resistance) =...

Homework Statement The nucleus of an atom has a charge of 65 protons. (a) What are the direction and magnitude of the electric field at 4.9 x 10^-10 m from the nucleus? (b) What are the direction and magnitude of the force exerted on an electron located at this distance? Homework...

r stands for culomb's law(?), and I'm not quite sure about the others..

Homework Statement A positive and a negative charge, each of magnitude 1.9 multiplied by 10^-5 C, are separated by a distance of 11 cm. Find the force on each of the particles. Homework Equations F = kq^2/r^2 r = sqrt(kq1q2/F) The Attempt at a Solution i'm not sure which...

2.2 kg

m = 1.10 or 7.9 g = 2200 mg = 2,200,000

Homework Statement A student librarian picks up a 2.2 kg book from the floor to a height of 1.10 m. He carries the book 7.9 m to the stacks and places the book on a shelf that is 0.35 m above the floor. How much work does he do on the book? Homework Equations...

oops, double posted. sorry. & that was correct, thanks!

Homework Statement A 0.105-kg hockey puck moving at 20 m/s is caught and held by a 77-kg goalie at rest. With what speed does the goalie slide on the ice? Homework Equations (Initial puck speed)(Puck mass) = (combined mass)*(final goalie velocity) The Attempt at a Solution...

Homework Statement Two freight cars, each with a mass of 2.5 multiplied by 10^5 kg, collide and stick together. One was initially moving at 3.4 m/s and the other was at rest. What is their final speed? Homework Equations m(vf-vi) The Attempt at a Solution (2.5*10^5)(0-3.4)=...

Homework Statement A compact car, mass 775 kg, is moving at 1.00 multiplied by 10^2 km/h toward the east. (a) Find the magnitude and direction of its momentum. (b) A second car, mass 2125 kg, has the same momentum. What is its velocity? (in km/h) Homework Equations The...

Homework Statement An animal-rescue plane flying due east at 36.0 m/s drops a bale of hay from an altitude of h = 52.8 m, as shown below. If the bale of hay weighs F = 161 N, what is the momentum of the bale the moment before it strikes the ground? Give both magnitude and direction...

oh okay, got it. thanks! :)