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Two small aluminum spheres, each of mass 0.0250 kilograms, are separated by 80.0 centimeters.How many electrons does each sphere contain? (The atomic mass of aluminum is 26.982 grams per mole, and its atomic number is 13.) How many electrons would have to be removed from one sphere and added to the other to cause an attractive force between the spheres of magnitude 1.00 x 10^4 N (roughly one ton)? Assume that the spheres may be treated as point charges. What fraction of all the electrons in each sphere does this represent?
The speed of sound in air is 332 m/s at 0°C. It increased 0.60 m/s for each degree above zero. compute the speed of sound at the temperature of the room.
A car with a mass of 1.50x10^3 kg starts from rest and accelerates to a speed of 18.0 m/s in 12s. Assume that the force of resistance remains constant at 400-N all through this time. What is the average power developed by the car's engine?
A machine part is made from a uniform solid disk of radius R = 0.18m and mass M = 8.3kg. A hole of radius R/2 is drilled into the disk, with center of the hole at the distance R/2 from the center of the disk.
The speakers produce the same single-frequency tone in either drawing and are in phase. The speed of sound is 343 m/s. Find the single smallest frequency that would produce both constructive interference in drawing 1 and destructive interference in d..
A partial record of a freely falling body showed only 3 consecutive points. The distance from the first to the second point was 24.550 cm. that from the first to the third was 58.92 cm.
A house sits in a valley and is 30 m lower than the water tower that serves it. What is the speed of water when it sprays out of a shower in the house?
A car is traveling 17 m/s when the driver sees a child standing on the road. He takes 0.8 s to react, then steps on the brakes and slows at 7.5 m/s2. How far does the car go before it stops.
A cyclist is using cranks with a length of 17cm and a front sprocket of radius 10cm. while standing up she places her body weight onto the forward pedal. the crank is initially horizontal and the force in the pedal is equal to body weight. cyclist..
An airplane is flying with a velocity of 81.6 m/s at an angle of 18.0 above the horizontal. When the plane is the distance 123 m directly above a dog that is standing on level ground, a suitcase drops out of the luggage compartment. How far from t..
What is velocity of insect after it has accelerated
The jumping squirrel. A squirrel wants to jump from a point A on a branch of a tree to a point B on another branch. The horizontal distance from A to B is x = 5 ft, and the vertical distance is y = 4 ft. If the squirrel jumps with an initial speed..
Block 1, of mass = 0.500 , is connected over an ideal (massless and frictionless) pulley to block 2, of mass , as shown. Assume that the blocks accelerate as shown with an acceleration of magnitude = 0.300 and that the coefficient of kinetic frict..
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