A copper cable is to be designed to carry a current of 300 A with a power loss of only 2.0 watts per meter. What is the required radius of the copper cable? (The resistivity of copper is 1.7 × 10^?8 ? / m.)
1.6 cm
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In air a light source emits a wavelength of 630 nm. Under water the wavelength of this light will be
a. 630 nm. b. less than 630 nm. c. more than 630 nm. d. unpredictable.
A tank with a volume of 0.15 m3 contains 25.0°C helium gas at a pressure of 100 atm. How many balloons can be blown up if each filled balloon is a sphere 31.0 cm in diameter at 25.0°C and absolute pressure of 1.20 atm? Assume all the helium is transferred to the balloons
a. 401 balloons b. 802 balloons c. 178 balloons d. 1 002 balloons e. 126 balloons
A horizontal force of 40 N pushes an object of mass 5.0 kg up an inclined plane through a distance of 1.6 m measured along the plane. The plane is inclined at an angle of 30° to the horizontal. Neglect friction and use g = 10 m/s2
(a) What is the work done by the horizontal force on the object? (b) What is the work done by the net force on the object? (c) What is the work done by the normal force on the object?
How many moons does Pluto have
What will be an ideal response?