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The Virgo cluster contains about 1300 galaxies and is at a distance of 16 Mpc. The galaxies have an RMS velocity about their center of mass of 600 km/s. How many galaxies do we need to observe in Virgo to reduce the error in Ho (hubble constant) due to peculiar velocities to 5%? Hint: look up how you calculate the error on a mean if you don't know.
A copper rod 87cm long is used to poke a fire. The hot end of the rod is maintained at 103%u2218C, What is the temperature of the rod 26cm from the cool end
A sinusoidal voltage ?v = (75 V) sin (100t) is applied to a series RLC circuit with L = 50 mH, C = 160 ?F, and R = 34 ?. What is the impedance of the circuit
If you weigh 690 {rm N} on the earth, what would be your weight on the surface of a neutron star that has same mass as our sun and a diameter of 21.0 {rm km}.
a particle moves along the path whose equation is r 6theta feet. if the angle theta 2t3 radians determine the
The temperature of a gold bar rises by 10.0°C when it absorbs 0.677 kJ of energy by heat. Determine the specific heat of gold
light falls on a pair of slits 0.00198 cm apart. the slits are 84.2 cm from the screen. the first-order bright line is
an electric dipole consists of 1.30g spheres charged to -1.90nc at the ends of a 8.00cm -long massless rod. the dipole
A vertical spring of spring constant 140N/m supports a mass of 80g. The mass oscillates in a tube of liquid. Estimate the damping constant b
On a perfect fall day, you are hovering at low altitude in a hot-air balloon, accelerated neither upward nor downward. What is the weight of the displaced air
a transformer has N^1 =350 turns and N^2 =2000 turns. what voltage is developed across the secondary coil?
questionexactly 3.0s after a projectile is fired into the air from a flat ground it is observed to have velocity v
A proton with a velocity in the positive x-direction enters a region where there is a uniform magnetic field B in the positive y-direction, The electric field should be in the...which direction
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