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A certain centrifuge produces a centripetal acceleration of magnitude exactly 1210g at a point 12.3 cm from the axis of rotation. Find the number of revolutions per second.
The average threshold of dark-adapted (scotopic) vision is 4.00 10-11 W/m2 at a central wavelength of 500 nm. If light having this intensity and wavelength enters the eye and the pupil is open to i
Find the wavelength of the ultrasonic wave emitted by a bat if it has a frquency of 4.0x10^4Hz. Radio station KSON in San Diego broadcasts at both 1240kHz(AM) and 97.3MHz(FM). a)Which of these signal
one force has a magnitude of 310 N 75.0 degrees from positive x-axis. determine the magnitude and direction of the second force.
A 1,400 kg car is moving at 12 m/s when the driver stops the car. What increase in the thermal energy of the car and its surroundings results from applying the brakes to bring the car to a stop? Ign
(a) What is the minimum uncertainty in the duck's speed? (b) Assuming this uncertainty in speed to prevail for 5.00 s, determine the uncertainty in Fuzzy's position after this time.
A computer disk drive is turned on starting from rest and has constant angular acceleration. If it took 0.63 s for the drive to make its second complete revolution, how long did it take to make the f
An electron moves though an electric field, and its speed drops from 2200 m/s to 1600 m/s. what is the potential difference between the two points at which the speed was measured?
A mechanical lift raises a 325 kg automobile to a height of 2.00 meters for servicing. How much work was done by the lift on the automobile? Express your answer in metric units to the nearest whole
A stone thrown upward from the top of a 100 ft cliff at 150 ft/s eventually falls to the beach below. (For this problem take the acceleration due to gravity to be -32 ft/s^2 ; take upwards to be a
Two plane mirrors are facing each other. They are parallel, d = 5 cm apart, and l = 20 cm in length, as the drawing indicates. A laser beam is directed at the top mirror from the left edge of the b
In a television set, electrons are accelerated from rest through a potential difference of 19 kV. The electrons then pass through a 0.28 Tesla magnetic field that deflects them to the appropriate sp
A car is traveling at 21 m/s when the driver spots a large pothole in the road a distance 19 m ahead. Does she manage to stop before reaching the pothole?
If the car can accelerate at 22.4 m/s2, how much time till you reach the speed of sound? How many kilometers will you travel before you reach that speed?
A thermos contains 150 cm3 of coffee at 85° C. To cool the coffee, you drop two 10-g ice cubes into the thermos. The ice cubes are initially at 0° C and melt completely. What is the final t
What is the apparent weight of a 75 KG astronaut 4200 km from the center of the earth's moon in a space vehicle.a) moving at constant velocity, and b) accelerating toward the moon at 2.9 m/s^2? stat
A small piece of dust of mass m = 1.5 µg travels through an electric air cleaner in which the electric field is 600 N/C. The electric force on the dust particle is equal to the weight of the p
What velocity would a proton need to circle the Earth 1100 km above the magnetic equator, where the Earth's magnetic field is directed horizontally north and has a magnitude of 4.00 10-8 T?
An electron moves in a circular path perpendicular to a constant magnetic field with a magnitude of 4.00 mT. The angular momentum of the electron about the center of the circle is 5.50 10-25 J&midd
A 1140-N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. A 1960-N crate hangs from the far end of the beam. Using the data shown in the figure,
A crate (140 kg) is in an elevator traveling upward and slowing down at 6 m/s2. Find the normal force exerted on the crate by the elevator. Assume g = 10 m/s2.
Two 450N blocks are connected by a light, flexible cord passing over a frictionless pulley. If the coefficient of friction under the blocks is 0.15. Find the tension in the cord.
A small ball of mass 51 g is suspended from a string of length 89 cm and whirled in a circle lying in the horizontal plane. If the string makes an angle of 31degrees with the vertical, ?nd the cent
A balloon with a radius of 14cm and an electric charge of 3.75x10^-9 C is brought within the electric field of the larger balloon so their centres are 40.0cm apart. Determine the magnitude of the e
A fan blade, initially at rest, rotates with a constant acceleration of 0.025 rad/s2. What is its angular speed at the instant it goes through an angular displacement of 4.2 rad?