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A star of mass 2.0 1028 kg that is 4.6 x 1020 m from the center of a galaxyrevolves around that center once every 4.6 x 108 years. Assuming that this star isessentially at the edge of the galaxy, each of the stars in thegalaxy has a mass equal to that of this star, and the stars aredistributed uniformly in a sphere about the galactic center, estimate the number of stars in the galaxy. (Do not round your answer to an order of magnitude.)
stars
A positron is a particle with the same mass and magnitude charge as an electron, but a positron has a positive charge. how fast is the positron moving
A 3.0 g. copper penny has a positive charge of 0.52 millicoulombs. What decimal fraction of its electrons has it lost
Electrostatic interactions with neighbors cause atoms in solids to be held in place as if bound together by tiny springs. How do you arrive at that conclusion
The burning of gasoline in a car releases about 3 × 10^4 kcal/gal. If a car averages 43 km/gal when driving 90 km/h, which requires 20 hp, what is an efficiency of the engine under those conditions.
Two long, straight wires are parallel and are separated by a distance of d = 0.230 m, The top wire in the sketch carries current I1 = 3.80 A, toward the right, and the bottom wire carries current I2 = 7.00 A, what are the magnitude and direction of t..
Thermal expansion increases the length of a clock's pendulum by a fractional increase of 4.1×10^-5, Under these conditions, how much error in timekeeping accumulates over 1 day
A tennis ball of mass m = 0.070 kg and speed v = 25 m/s strikes a wall at a 45° angle and rebounds with the same speed at 45°
A 1000kg car moving 40m/s skids to a stop. During the skid, the only force is the frictional force between the tires and the road, What is the initial kinetic energy of the car
Two balls of the same mass are accelerated by different net forces such that one ball gains a velocity twice that of the other ball in the process. Is the work done by the net force acting on the faster moving ball twice that done on the slower mo..
A proton moving at 5.0 × 104 m/s horizontally enters a region where a magnetic field of 0.12 T is present, What magnitude force acts on the proton
A machine gun fires 23 g bullets horizontally at 260 m/s at a constant rate of 30 bullets/s. what is the average force exerted on the door
A flashlight on the bottom of a 3.60 m deep swimming pool sends a ray upward, What angle (in air) does the emerging ray make withthe water's surface
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