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Two 2.0-cm-diameter insulating spheres have a 5.70 cm space between them. One sphere is charged to + 87.0 nC, the other to - 84.0 nC. What is the electric field strength at the midpoint between the
How many protons are in the beam traveling close to the speed of light in the Tevatron at Fermilab, which is carrying 12.73 mA of current around the 6.3-km circumference of the main Tevatron ring?
Two in-phase loudspeakers emit identical 1000 Hz sound waves along the x-axis. What distance should one speaker be placed behind the other for the sound to have an amplitude 1.10 times that of each
The magnitude of each of the charges is 6.0 µC, and the lengths of the sides of the triangle are 2.0 cm. Calculate the magnitude of the net force that each charge experiences.
A package is sliding from rest down an incline at an angle "phi", and encounters a rough section that starts at height "2h" and ends at height "h". The starting point for the package is at height "x
A carbon wire and a Nichrome wire are connected one after the other. If the combination has total resistance of 13.0 k at 20°C, what is the resistance of each wire (in Kohms) at 20°C so that
A sinusoidal transverse wave of amplitude ym = 8.4 cm and wavelength = 5.3 cm travels on a stretched cord. Find the ratio of the maximum particle speed (the speed with which a single particle in the
A 45kg woman stands up in a 60kg canoe 5m long. She walks from a point 1m from one end to a point 1m from the other end. If you ignore resistance to motion of the canoe in the water, how far does th
Two small plastic spheres each have a mass of 2.0 and a charge of -50.0. They are placed 2.0 apart. aa. What is the magnitude of the electric force between the spheres?
A 120-kg tackler moving at 5 m/s meets head-on (and tackles) a 80-kg halfback moving at 5 m/s, after which they couple together. What will be their mutual speed after the collision?
If electrical energy costs 12 cents, or $0.12, per kilowatt-hour, then what would the following events cost? (a) Burn a 100 W light bulb for 24 h straight.
A resistor of unknown resistance and a 43.0-O resistor are connected across a 128.0-V emf device in such a way that an 14.0-A current flows. What is the value of the unknown resistance?
Find the coefficient of friction of the surface. (Assume friction is the only horizontal force. Show a force diagram and write down he equations for Newton's second law.)
The surface of the Sun is appoximately 5,700 K and the temperature of the Earth's surface is about 290 K. What total entropy change occurs when 1,000 J of heat energy is transferred from the Sun to
A plastic rod is charged to -20 by rubbing. a. Have electrons been added to the rod or protons removed? Explain. b. How many electrons have been added or protons removed?
The initial velocity of the kit is 12 m/s at an angle of 61° above the horizontal. At the instant when the kit is caught, it is traveling horizontally, so its vertical speed is zero. What is the
When a 58 g tennis ball is served, it accelerates from rest to a speed of 45 m/s. The impact with the racket gives the ball a constant acceleration over a distance of 38 cm. What is the magnitude of
A car speeds along the curved exit ramp of a freeway. The radius of the curve is 86 m. A 70 kg passenger holds the arm rest of a car door with a 220 N force to keep from sliding across the front sea
A 0.050-kg ball at the end of a string rotates at constant speed in a vertical circle with a radius of 0.23 m. What is the maximum speed of the ball so that the tension is not to exceed 12 N?
A potential difference of 30.0 V is applied across a wire of cross-sectional area 5.01 mm^2 and length 929 km. The current passing through the wire is 2.311×10^-3 A.
A package is sliding from rest down an incline at an angle phi, and encounters a rough section that starts at height 2h and ends at height h. The starting point for the package is at height xh, and
A uniformly charged sphere had a volume charge density ρ and a radius R. Find the distance from the center of the sphere where the electric field has the same strength as the field at radius r =
A cannonball is fired from the roof of a building, with the cannon's muzzle 54.0 m above the ground, at a muzzle speed of 95 m/s and an angle of 30.0 degrees above the horizontal. Calculate the hori
The force on a particle is directed along an x axis and given by F = 0.99(x/5.6 - 2.2) where x is in meters and F is in Newtons. Find the work done by the force in moving the particle from x = 0 to