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The microwave radiation left over from the Big Bang explosion of the universe has an average energy density of 3.88 × 10^(-14) J/m3. What is the rms value of the electric field of this radiati
It has been suggested that rotating cylinders about 12 mi long and 4.6 mi in diameter be placed in space and used as colonies. What angular speed must such a cylinder have so that the centripetal ac
A capacitor with an initial potential difference of125V is discharged through a resistor when a switch between them is closed att= 0. Att=5.0s, the potential difference across the capacitor is1.80V
A rotating merry-go-round makes one complete revolution in 4.0s. A) What is the linear speed of a child seated 1.2m from the center?
What is the magnitude of the electric force on one of the masses? - I got 0.00225N and I need it in two significant figures so I typed in 2.3x10^-3 and 0.23x10^-2 and they are very close but I have
The bullet, from a .22 caliber rifle, has an initial speed of 330 m/s and it comes to rest inside the block. How far from the edge of the table will the bullet-block system hit the floor?
Two points on a string are observed as a traveling wave passes them. The points are at x1 = 0 and x2 = 1 m. The transverse motion of the two points are found to be as follows: y1 = 0.2 sin (3*pi*t)
A pot containing a plant, weighing 76 N is hung from the ceiling with a group of bungee cords. If pulled down and released, the pot oscillates vertically with period 6 s. What is the effective force
The static and kinetic coefficients of friction between the wood and the cement are 0.56 and 0.35, respectively. How many newtons of tension, T, were required in the the pulley rope, for the crate t
A man is using a cord to tow a sled at constant speed on a horizontal ground surface. The mass of the sled is 10 kg. The man pulls on the cord with a force of 71 N. The cord is straight and at an an
A force has a strength of 87 N and makes an angle of 21 degrees with respect to the positive x axis, in the x-y plane. What is the y component of this force (in N)?
A scaffold of mass 56 kg and length 5.5 m is supported in a horizontal position by a vertical cable at each end. A window washer of mass 88 kg stands at a point 1.3 m from one end. (a) What is the t
What is the height, hm in meters? Write an expression for the ball's total mechanical energy, Em, in terms of its maximum height, hm.
A 1.15 kilo ohm resistor and a 1.2 nanoF capacitor are connected in series to a 1250 Hz generator with an rms voltage of 14.2 V. A) what is the rms current in the circuit?
This toy is so adorable you pull the monkey down an additional d = 5.3 cm from equilibrium and release it from rest, and smile with delight as it bounces playfully up and down. Part (a) Using the g
What is the magnitude of the Earth's magnetic field where such an electron orbits?
A 0.120 kg croquet ball makes an elastic head-on collision with a second ball initially at rest. The second ball moves off with half the original speed of the first ball. (a) What is the mass of the
Where will the bungee jumper experience the greatest acceleration? Choose one answer only. when he first begins to fall just before the bungee begins to stretch just after the bungee begins to stret
Two 2.0-cm-diameter insulating spheres have a 6.70cmspace between them. One sphere is charged to + 83.0nC, the other to - 15.0nC What is the electric field strength at the midpoint between the two sph
A system loses 640 J of potential energy. In the process, it does 660 J of work on the environment and the thermal energy increases by 120 J . Find the change in kinetic energy.
find the force on the rod as a function of velocity v, and write Newton's second law for the rod as a function of v.
Specify the electric field strength E1,E2, and E3 in Newtons/Coulomb
An electron with kinetic energy 1.64 keV circles in a plane perpendicular to a uniform magnetic field. The orbit radius is 23.0 cm. Find the speed of the electron, the magnetic field, the frequency
Find the average horizontal force exerted by the ground on the feet of a sprinter of mass 50.0 kg who accelerates from rest to a speed of 10.0 m/s in a time interval of 1.00 s.
What is the absolute value of the net magnetic field 25.0 due west of the wire if the Earth's field there points north but downward, 39 below the horizontal, and has magnitude 5.0 ?