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A square metal plate of edge length 12.0 cm and negligible thickness has a total charge of 7.50×10-6 C. Estimate the magnitude E of the electric field just off the center of the plate (at, say,
Two small spheres spaced 50.0 centimeters apart have equal charge. How many excess electrons must be present on each sphere if the magnitude of the force of repulsion between them is 4.40 x 10^{-21}
An elevator and its load have a combined mass of 1450 kg. Find the tension in the supporting cable when the elevator, originally moving downward at 13 m/s, is brought to rest with constant accelera
A police car is traveling east at 40.0 m/s along a straight road, overtaking a car ahead of it moving east at 30.0 m/s. The police car has a malfunctioning siren that is stuck at 1 000 Hz. What is t
A 0.150 kg particle moves along an x axis according to x(t) = -13.00 + 2.00t + 4.50t2 - 3.50t3, with x in meters and t in seconds. In unit-vector notation, what is the net force acting on the partic
Tired of walking down the stairs a 75 kg engineering student designs an ingenious device for reaching his third floor dorm room. A 60 kg block at rest on the ground is attached to a rope that passes
Two lenses with focal lengths f1=5cm and f2=10cm are located 5cm apart. If an object 2.50 high is located 15.0 cm in front of the first lens, find the position and size of the final image.
A 5.0kg box is pulled horizontally with a 45-N force that makes angle of 40 degrees with the horizontal. The coefficient of kinetic friction of the surface is 0.20 What is the magnitude of the accel
A decorative light fixture in an elevator consists of a 2.0 kg light suspended by a cable from the ceiling of the elevator. from this light a separate cable suspends a second .80 kg light.
Consider an annular disk in the xy plane, centered on the origin. (An annular disk is a disk with a hole missing from the middle.)
If the technician holds the probe at an angle such that the blood is flowing directly away from the probe the speaker produces sound at fb = 200 Hz. Using this information and the fact that the spee
What is the electric field strength inside the capacitor if the spacing between the plates is 1.40mm? (answer has to be in V/m)
When the ball reaches the (x, y) point (0.30 m, 0), what is the net force acting on it from the spheres, in unit-vector notation?
A singly charged ion of unknown mass moves in a circle of radius 13.8 cm in a magnetic field of 1.01 T. The ion was accelerated through a potential difference of 7.28 kV before it entered the magne
A positron (q = +e) moves at 4.88 x 107 m/s in a magnetic field of magnitude 0.410 T. The magnetic force on the positron has magnitude 2.41 x 10-12 N. What is the component of the positron's velocity
A 2,021-kg car is moving down a road with a slope (grade) of 13% while slowing down at a rate of 3.4 m/s^2. What is the direction and magnitude of the frictional force? (define positive in the forwa
When the tension of the cable is steady at 1.29 × 104 N, with what force is the boat's engine pushing the boat?
A horizontal rifle is fired at a bull's -eye. the muzzle speed of the bullet is 670m/s the gun is pointed directly at the center of the bull's -eye but the bullet strikes the target 0.025m below the
what are the components of the coyote's velocity just before he reaches the ground?
In a classical model of the hydrogen atom, the electron orbits the proton in a circular orbit of radius 0.053 What is the orbital frequency?
Two point charges lie on the 10.4cm axis. A charge of 9.8 x 10^-6 C is at the origin and a charge of -4.6 x 10^-6 C is at the x = 10.4cm. At what position x would a third charge q3 be in equilibrium
An electron in a uniform electric field increases its speed from 1.7×107 to 4.1×107 over a distance of 1.3. what is the electric field strength?
An exoplanet of mass = 5 times the mass of Jupiter and 3 Jupiter radii orbits a star identical to the sun at a distance of 3 AU from the star. Assuming the a circular orbit: a) estimate the period o
It is observed that it took 18 for the pulse to return. What is the tension in the cable?