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A small glass bead has been charged to +18 nC. A metal ball bearing 1.0 cm above the bead feels a 0.035 N downward electric force. What is the charge on the ball bearing?
nC
The tractor beam exerts a constant force of 4.0 104 N on the shuttlecraft. Both spacecraft are initially at rest. Explain how far does the starship move as it pulls the shuttlecraft aboard?
You and a friend are sitting out on the balcony of your apartment which is 24 m above the ground. Where does your friend's ball land
Identical objects are located at the same distance from two spherical mirrors, A and B. Find the ratio fA/fB of the focal lengths of the mirrors
What is the apparent weight of a cube of iron of volume 0.2 m3 when it is submerged in water? The density of iron is 7800 kg/m3
What is the range of wavelengths for FM radio (88 MHz to 108 MHz) and AM radio (535 kHz to 1700 kHz)? (answer: for FM: 2.78m to 3.4m, for AM: 176m to 561m)
Calculate each of the following if the electrons exit the field with a speed of 4.45x10^6 m/s and distance between the plates is 2.07 cm.
Calculate the kinetic energy acquired by a 11 kg nail when it is struck by the 530 kg hammer moving with an initial speed of 4.4m/s.
A hydrogen atom has a radius of about 0.05 nm. estimate the electron's kinetic energy in three dimensions.
A small immersion heater is rated at 350 W. Estimate how long it would take a heat a cup of soup (assume this is 250 mL of water) from 20C to 60C.
A constant force, = (1.27, -2.33, 3.93) N, acts on an object of mass 10.3 kg, What is the total work done by this force
The rock reaches a maximum height of 2×10^3 m, above the surface of the planet, before it falls back down. What was the first speed of the rock as it left the astronaut's hand.
what is the total amount of work done by friction. The supplies should be dropped how various seconds before the plane is directly overhead.
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