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A 0.96-m-long metal rod has a radius of 2.1 cm and a resistance of 6.3 · 10 ? 5 ?. What is the resistivity of the metal
A hot iron horseshoe (mass = 0.470 kg), just forged, is dropped into 1.44 L of water in a 0.340 kg iron pot initially at 19.1°C. calculate the initial temperature of the hot horseshoe
A proton moves at a speed of 995 m/s in a direction perpendicular to a magnetic field with a magnitude of 0.76 T
You are driving north on 107th Avenue at a speed of 32.6 mph. At what frequency do you year the siren
You are driving east on 8th Street (Tamiami Trail) at a speed of 32. In the rearview mirror, What is the frequency of the siren
Suppose a star with radius 8.39 multiply.gif 108 m has a peak wavelength of 686 nm in the spectrum of its emitted radiation. compute the surface temperature of the star
An Ar+ laser emits radiation at a wavelength of 515 nm, and a power of 7 W. Determine how many argon ions
A simple circuit is set up that only consists of a 12 V battery connected to a light bulb with a resistance of 4 Ohms. What current flows through the light bulb
Suppose in the drawing that I1 = I2 = 13.6 A and that the separation between the wires is 0.0244 m. What is the magnitude of the external field
We have studied diffraction from a single slit, where light is sent through a thin opening. how thick was this strand of hair
A massless, rigid board is placed across two bathroom scales that are separated by a distance of 1.74 m. Find the weight of the person
A 5.0-kg object with a speed of 4.0 m/s collides head on with a 10-kg object moving toward it with a speed of 3.0 m/s. what is the post-collision speed of the 5.0-kg object
what is the buoyant force on a beachball of diameter 20.0 cm that is HALF submerged in a fresh water pool
A uniform solid ball that has a mass of 21.8 g and a radius of 5.1 cm rests on a horizontal surface. What is the angular speed of the ball after impact
A surgeon is attempting to correct a detached retina by using a pulsed laser. If the pulses last for 35.1 ms, how many photons are present in each pulse
A 25.5-mW laser beam of diameter 2.08 mm is reflected at normal incidence by a perfectly reflecting mirror. Calculate the radiation pressure on the mirror
A load of 52.5 N attached to a spring hanging vertically stretches the spring 5.29 cm. What force is required to stretch the spring by this amount
Most materials will expand when the temperature is increased. The change in size will depend on several factors, including the original size, What is the fractional change in length
A 2000 kg statue falls into a circular jacuzzi with a diameter of 5 m, What is the average density of the statue
When 4425 J of heat are added to a 0.16-m-long silver bar, What is the mass of the bar
If the mass of a wheel is increased by a factor of 6, by what factor is the moment of inertia increased
Consider a merry-go-round that has the form of a disc with radius 5.5 m and mass 130 kg. what is the total moment of inertia
A piece of glass has a temperature of 85.8° C. Liquid that has a temperature of 43.0° C is poured over the glass, completely covering it, determine the specific heat capacity of the liquid
An old-fashioned (vinyl) record rotates at a constant rate of 45 rpm. how far does a point on the edge travel
A top has a moment of inertia of 2.78 × 10^?4 kg·m^2 and is initially at rest. It is free to rotate about a vertical stationary axis. What is the angular velocity of the object