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During a liquid-to-solid phase change of a substance, its change in entropy is -4.24 x 103 J/K. If 1.42 x 106 J of heat is removed in the process, what is the freezing point of the substance?
When two identical ions are separated by a distance of 6.0×10-10 m, the electrostatic force each exerts on the other is 5.8×10-9 N. How many electrons are missing from each ion? Express yo
A 43.3 kg boy and a 60.0 kg girl are on the surface of a frozen lake, 10.5 m apart. Using a rope, the boy exerts a horizontal 5.90 N force on the girl, pulling her toward him. Calculate the magnitud
Determine the acceleration and position of the bullet as a function of time when the bullet is in the barrel. use t as necessary and round all numerical coefficients to exactly 3 significant figures
A long wire has a radius of 1.82 mm. If charges on the surface of the wire produce an electric field just outside its surface of 624 N/C, what is the magnitude of the electric field a distance of 3.
An athlete executes a long jump, leaves the ground at an angle of 25 degrees from the ground and lands 5.80m away. a) what is the takeoff speed in m/s?
Car 1 weighs 4800 lbs and car 2 weighs 3900 lbs. after this accident car 1 skids for 50 feet and car 2 for 70 feet. The cars have the same braking system and a test skid yields a distance of 42 feet
While running down the road, they come to a deep gorge, 14.4 m straight across and 100 m deep. The Roadrunner launches himself across the gorge at a launch angle of 16° above the horizontal, an
The average distance between Earth and the moon is 384,000 km. Find the net gravitational force the Earth and the Moon exerts on 3.00 x 10^4-kg spaceship located halfway between them.
The heating element of a clothes dryer has a resistance of 23 ohms and is connected across a 240 V outlet. What is the current in the heating element?
A third charge of +4q is located on the x axis at such a place that the net electrostatic force on the charge at the origin quadruples, its direction remaining unchanged. Where should the third char
A uniform line charge that has a linear charge density 4.7 nC/m is on the x axis between x = 0 to x = 5.0 m.
Consider a defibrillator, acting as a 32 μF capacitor and a 47 kΩ resistor in a series RC circuit. The circuitry in this system applies 5000 V to the RC circuit to charge it. what is the ma
A 100 μF capacitor wired in a simple series RC circuit is initially charged to 10 μC and then discharged through a 10 k Ω resistor. a) what is the time constant of the circuit?
Two 100m 14 gauge wires (1.63 mm diameters), one of copper and one of aluminum, are soldered together and the 200m wire is them connected to a 6 V dc power supply with unlimited current. a) How muc
Calculate the conductance and the resistance of a 10 m length of 14 gauge copper wire, which has a diameter of 1.63 mm. If this wire is connected directly to the terminals of a 12 V dc power supply,
A projectile is launched on the Earth with a certain initial velocity and moves without air resistance. Another projectile is launched with the same initial velocity on the Moon, where the accelerat
Suppose you had two small boxes, each containing 1.0g of protons. If one were placed on the moon by an astronaunt and the other were left on the earth, and if they were connected by a very light str
A 6.40 tall cylinder floats in water with its axis perpendicular to the surface. The length of the cylinder above water is 1.70 . What is the cylinder's mass density?
How many electrons must be removed from A and put onto B to make the electrostatic force that acts on each object an attractive force whose magnitude is 29.4 N?
A stone thrown horizontally from the top of a 19-m tower hits the ground at a point 18 m from the base of the tower. (Ignore any effects due to air resistance.) (a) Find the speed at which the stone
Take the center of the clock as the origin, and use a Cartesian coordinate system with the positive x axis pointing to 3 o'clock and the positive y axis pointing to 12 o'clock. What is the magnitude
How far does each bullet travel before the observer hears the report of the rifle? Assume that the bullets encounter no obstacles during this interval, and ignore both air resistance and the vertica
The roof of a two-story house makes an angle of 29° with the horizontal. A ball rolling down the roof rolls off the edge at a speed of 4.6 m/s. The distance to the ground from that point is 7.4
A 200 g block attached to a horizontal spring is oscillating with an amplitude of 2.0 cm and a frequency of 2.0 Hz. Just as it passes through the equilibrium point, moving to the right, a sharp blo