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A mass of 20 kg is attached to a spring whose spring constant is 2000 N/m. The mass is displaced and released. The mass slides on a frictionless surface A. What is the period B. What is the frequen
If the system is moving so that the hanging mass is moving downward, then find the magnitude of the acceleration of each mass and the tension in the string.
An asteroid has a mass of 3.66 x 10^20 kg and a radius of 8.2 x 10^5 m. If a 25 kg mass is dropped from 10 m above the "ground" of the asteroid, how long will it take the mass to fall to the ground?
The lift force (due to the helium) on the balloon is 30 N. If the tension in the string exceeds 50 N of force, the string will break. How great a force (magnitude) can a horizontal wind apply to the
At what height, will the baloon be fully blown up? Will the baloon ever reach the height when it is fully blown up? If yes, what is the height? Please give me a detailed explanation as to how you ob
The value of W is about 4.24 eV for zinc. What is the maximum wavelength that light falling on the zinc can have if it is to be able to eject electrons? [For comparison, visible light has wavelength
If the distance between adjacent interference bright spots (for low n) is about 2.5 cm on the screen, what is the wavelength of the light involved?
The baloon is filled with so much helium that the net force exacted on it as well as the weight it is lifting is 30N. How many mol helium is there in the gas? Please give me a detailed explanation a
(It is made up of a square solenoid instead of round one bent into a doughnut shape.) What is the magnitude of the magnetic field inside the toroid at (a)the inner radius and (b)the outer radius?
The speed of the electron is 0.0609c (c = speed of light, equal to 2.998 x 108 m/s). Find the current i (in A) in the solenoid.
A 15.0g plastic ball is dropped from a height of 2.60 m and is moving at 2.80m/s just before it hits the floor How much mechanical energy was lost during the ball's fall?
What is the maximum number of passengers that can ride in the elevator? Assume that an average passenger has mass 65.0 kg . Express you answer as an integer.
An electron moving with a speed of 9.5 105 m/s in the positive z direction experiences zero magnetic force. When it moves in the positive x direction it experiences a force of 2.0 10-13 N that point
The current density in a cylindrical conductor of radius R = 44.9 cm, varies as J(r) = J0r/R (in the region from zero to R), where J0 = 0.449 C/m2. a) Find the magnitude of the magnetic field at r =
Two long, straight parallel wires are separated by a distance of 20.1 cm. Each wire carries a current of 26.1 A in the same direction. What is the magnitude of the resulting magnetic field at apoin
Julie carries an 8.0 kg suitcase as she walks 18 m along a horizontal walkway to her hotel room at constant speed of 1.5 m/s. How much work does julie do in carrying her suitcase?
A 9.0 battery supplies a 2.0 current to a circuit for 4.8. How much charge has been transferred from the negative to the positive terminal? Express your answer using two significant figures.
The starter motor of a car engine draws a current of 200 from the battery. The copper wire to the motor is 6.0 in diameter and 1.3 long. The starter motor runs for 0.90 until the car engine starts.
One recent study has shown that x rays with a wavelength of 0.0050 can produce significant numbers of mutations in human cells. Calculate the energy in of a photon of radiation with this wavelength.
The two most prominent wavelengths in the light emitted by a hydrogen discharge lamp are 656 {\rm nm} (red) and 486 {\rm nm} (blue).
What is the potential difference measured across the plates now (as a multiple of the original potential difference)?
The wire is wound into a thin, flat coil of many turns that has a radius of 0.150 m. The ends of the wire are connected to a 12.0-V battery. Find the magnetic field strength at the center of the coi
(a) What is the capacitance in picofarads of the system? (b) If the charges are changed to +260 pC and -260 pC, what does the capacitance in picofarads become? (c) What does the potential difference
A single conducting loop of wire has an area of 7.8×10-2 and a resistance of 120. Perpendicular to the plane of the loop is a magnetic field of strength 0.38. what rate (in) must this field ch
The ground state of Ne-17 is unstable. It's half-life has been measured to be 109 ms. (a) What is the energy width of the state? (b) List two possible decay mechanisms.