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A string vibrates at its third-harmonic frequency. The amplitude at a point 30 cm from one end is half the maximum amplitude. How long is the string?
Double stranded DNA molecule negatively charged with a charge density of -e per nanometer 1. what is the electric field due a DNA molecule at a distance of 10 nm?
The strings make an angle of 30 with rod. A) What is the tension in the lower string Tl ?
Would you be willing to back financially an inventor who is marketing a device that she claims takes in 25000J of heat at 600K, expels heat at 300K, and does 12000J of work? Explain.
A rocket rises vertically, from rest, with an acceleration of 3.2 m/s^2 until it runs out of fuel at an altitude of 870 m. After this point, its acceleration is that of gravity, downward. Velocity
If 500 J of work are required to carry a 40 C charge from one point to another, the potential difference between these two points is:
A metal sphere of radius 20 cm has a net charge of 6.0 x 10-8 C. (a) What is the electric field at the sphere's surface? (b) If V = 0 at infinity, what is the electric potential at the sphere's surfac
What is the excess charge on a conducting sphere of radius r = 0.36 m if the potential of the sphere is 1050 V and V = 0 at infinity?
An empty hollow metal sphere has a potential of +470 V with respect to ground (defined to be at V = 0) and has a charge of 5.8 10-9 C. Find the electric potential at the center of the sphere.
Still not sure which equation to use. Asked previously and feel the answer was not right. Stone thrown vertically upward with a speed of 24 m/s. How fast is it moving when it reaches a height of 20.
In a rectangular coordinate system, a positive point charge q = 8.00 nC is placed at the point x= 0.250 m, y = 0, and an identical point charge is placed at x= -0.250 m, y = 0. Find the x and y comp
That is, what initial speed must the electron have to reach an infinite distance from the sphere and have zero kinetic energy when it gets there?
What is the magnitude of the electric field at the point (3.15 - 2.05 + 4.15) m if the electric potential is given by V = 2.00xyz2, where V is in volts and x, y, and z are in meters?
If the potential halfway between the plates is then +3.0 V, what is the electric field in the region between the plates? (Take directly towards the negative plate to be the positive direction.)
A liquid of unknown specific heat at temperature 20c was mixed with water at 80c in a container.final temperature was 50c and total mass was 100g. the second experiment at the same temperature was 2
A runner with a mass of 60kg accelerates from 0 to 9 m/s in 3 s. Fin A runner with a mass of 60kg accelerates from 0 to 9 m/s in 3 s. Find the net force on the runner using the alternate form of New
If a room needs completely new air every 20.0 minutes, the volume of the room is 2560 cubic feet, what is the volume of air per second that is pumped into the room?
You are driving home from school steadily at 95 {\rm km/h} for 150 {\rm km}. It then begins to rain and you slow to 50 {\rm km/h}. You arrive home after driving 3 hours and 20 minutes. (a) How far
A stone is dropped from the roof of a high building. A second stone is dropped 2.00 {\rm s} later. How far apart are the stones when the second one has reached a speed of 14.0 {\rm m/s}?
A rocket rises vertically, from rest, with an acceleration of 3.2 m/s^2 until it runs out of fuel at an altitude of 870 m. After this point, its acceleration is that of gravity, downward. What is th
Two locomotives approach each other on parallel tracks. Each has a speed of v = 80 km/h with respect to the ground.
Three resistors are connected in series across a 19-V power supply. If the potential drop across resistors 1 and 2 are 3.2 volts and 3.0 volts, what is the potential drop (in volts) across resistor
A soccer player takes a penalty kick 11.0m from goal. To score, she has to shoot the ball under the 2.44m high cross bar. if she kicks at 19m/s what range of launch angles will result in goal. note
What will a spring scale read for the weight of a 58 kg woman in an elevator that moves as follows?
What is the radius of a hydrogen-filled balloon that would carry a load of 5550 N (in addition to the weight of the hydrogen) when the density of air is 1.23 kg/m3?