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The huge volcanic eruption on the island of Krakatoa, Indonesia, in 1883 was heard on Rodrigues Island, 4,782 km (2,970 miles) away. How long did it take (in seconds) for the sound to travel to Rodrigues? (Assume the air temperature is 20°C.)
What is the tension in each cable if angle between each and the direction the crate moves is 12°.
Two inductors L1 = 1.17 H and L2 = 2.13 H are connected in parallel and separated by a large distance so that the magnetic field of one cannot affect the other, Calculate the equivalent inductance.
Four point charges have the same magnitude of 2.3 × 10-12 C and are fixed to the corners of a square that is 3.8 cm on a side, Determine the magnitude of the net electric field that exists at the center of the square
A skateboarder, starting from rest, rolls down a 12.5 m ramp. When she arrives at the bottom of the ramp her speed is 6.10 m/s. (a) Determine the magnitude of her acceleration, assumed to be constant. .m/s2 (b) If the ramp is inclined at 26.5° wit..
A boy whirls a stone using an r-m long string in a horizontal circle h m above the ground. The string broke, and the stone flies off horizontally and strike the ground x m away.The velocity with which the stone flies off the circle is? The centrip..
A 20.00 kg child is on a swing that hangs from 3 m long chains. What is her maximum speed if she swings out to a 45.0 o angle.
a rock is thrown downward from the top of a building 168 ft high at an angle of 60 with the horizontal. how far from the base will the rock land
A neutron star is the remnant left after certain supernovae (explosions of giant stars). Typically, neutron stars are about 20 in diameter and have around the same mass as our sun. What is a typical neutron star density in g/cm^3?
The microwave radiation left over from the Big Bang explosion of the universe has an average energy density of 3.89 × 10-14 J/m3
Does an apple tree exert a gravitational force on the earth and if so, how large of a force, Consider and explain this question when the apple is attached to the tree
A steel cable with total length 59 m and mass 110 kg is connected to two poles. The tension in the cable is 1,260 N, and the wind makes the cable vibrate with a frequency of 2 Hz. Calculate the wavelength of the resulting wave on the cable
A 1.5-H inductor is connected in series with a 200-Ω resistor through a 15-V dc power supply and a switch, what is the maximum energy stored by the inductor
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