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The 2.2 kg, 20 cm diameter disk in the figure below is spinning at 280 rpm. How much friction force must the brake apply to the rim to bring the disk to a halt in 5.0 s?
How much heat is required to convert solid ice with a mass of 525 g and at a temperature of -10.5 °C to liquid water at a temperature of 69.5 °C? (The specific heat of ice is cice = 2100 J/
A box of well known breakfast cereal states that one small portion of the cereal contains 110 Calories (1 Cal = 4186 J). If 2.0 % of this energy could be converted by a weight lifter's body into wo
A photomultiplier tube in a scintillation counter contains 12 of the special electrodes or dynodes. Suppose each dynode produces 5 electrons for every electron that strikes it. One photoelectron st
Compare the force an abrupt(hard) and a cushioned (soft) collision if the impulse are equivalent. use word and also sketch the force vs. time graphs.
A 1300 {rm kg} wrecking ball hangs from a 20 {rm m}-long cable. The ball is pulled back until the cable makes an angle of 24.0^circle with the vertical. By how much has the gravitational potential
Homozygotes for AT rarely survive to adulthood. Heterozygotes rarely show symptoms while young but are at substantially incrased risk for contracting several forms of cancer as adults. Explain.
A ship sets out to sail to a point 182 km due north. An unexpected storm blows the ship to a point 158 km due east of its starting point. How far must it now sail to reach its original destination?
The loop in figure shown carries a current I=2.50A. The semicircular portion has a radius R=5.00cm and L=10.0cm. Determine the magnitude and direction of the magnetic field at point A.
A metal sphere of radius a carries charge Q,it is surrounded out to a radius b, by linear dielectric material of permittivity, find the electric displacement.
Moe, Larry, and Curly stand in a line with a spacing of d = 1.30 m. Larry is 3.00 m in front of a pair of stereo speakers 0.800 m apart, as shown in the figure . The speakers produce a single-frequ
An ideal heat-engine is to be used in an environment where the ambient temperature is 22.5 °C. What should be the minimum temperature of the hot heat reservoir in order to reach at least 46.4 pe
How does the velocity of air moving over the top of the wing of an airplane in flight compare to the velocity of air moving under the wing?
An automobile club plans to race a 760 kg car at the local racetrack. The car needs to be able to travel around several 140 m radius curves at 94 km/h. What should the banking angle of the curves be
The measured masses of these isotopes are 2.32×10-26 {rm kg} ({^{14,}{rm N}}), 1.99×10-26 kg and 2.49×10-26 Kg. Find the separation of the isotopes at the detector.
A 5.00m long diving board of negligible mass is supported by two pillars. One pillar is at the left end of the diving board: the other is 1.50m away. Find the forces exerted by the pillars when a 9
In a parallel plate capacitor, two plates are being discharged by a constant current. Each plate has a radius of 4.00 cm. During the discharging, at a point between the plates at radial distance 2.0
A 1300 {rm N} crate slides 15 {rm m} down a ramp that makes an angle of 35^circ with the horizontal. If the crate slides at a constant speed, how much thermal energy is created?
An electron with an initial speed of 4.00×105 is brought to rest by an electric field. What was the initial kinetic energy of the electron, in electron volts?
A skier is accelerating down a 30.0 hill at 1.80. a) What is the vertical component of her acceleration?
A bucket of mass 2.00 is whirled in a vertical circle of radius 1.55 . At the lowest point of its motion the tension in the rope supporting the bucket is 30.0 . find the speed of the bucket.
A water-skier is being pulled by a tow rope attached to a boat. As the driver pushes the throttle forward, the skier accelerates. A 67.1-kg water-skier has an initial speed of 7.4 m/s. Later, the sp
A damped mass-spring system oscillates at 255 Hz. The time constant of the system is 2.0 s. At t = 0, the amplitude of oscillation is 7.0 cm and the energy of the oscillating system is then 70 J. (
Looking at the three curves, one can infer some details about the motion of the car. For example, the curve representing the distance traveled x starts going up from the beginning until the car come
Moe, Larry, and Curly stand in a line with a spacing of = 0.900 . Larry is 3.00 in front of a pair of stereo speakers 0.800 apart, as shown in the figure . The speakers produce a single-frequency to