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A 100-lb block of ice slides down an incline 5.0 ft long and 3.0 ft high. A worker pushes up on the ice parallel to the incline so that it slides down at constant speed.
What is the resistance of a circular rod 1.0 cm in diameter and 45 m long, if the resistivity is 1.4 × 10-8 Ω·m?
An x-ray beam with wavelength 0.280nm is directed at a crystal. As the angle of incidence increases, you observe the first strong interference maximum at an angle 23.0 ° . What is the spacing d bet
You have a 51.3-mF capacitor initially charged to a potential difference of 12.5 V. You discharge the capacitor through a 3.75-Ω resistor. What is the time constant? After what multiple of the
Consider a 1000-W iron whose base plate is made of 0.5-cm-thick aluminum alloy 2024-T6 (density= 2770 kg/m3 and cp= 875 J/kg • °C). The base plate has a surface area of 0.03 m2. Initially,
At the highest point, the shell explodes into two fragments (masses m1+m2=M) with an additional energy E, traveling in the original horizontal direction. find the distance separating the two fragmen
Do you observe constructive or destructive interference between the direct and reflected waves? (Hint: Does a phase change occur when the waves are reflected?) "DESTRUCTIVE"
A bullet was fired horizontally with 20 m/sec from the top of a building 20m high. When the bullet was ;10m above the ground incidentally it hits a bird. Find the time taken to hit the bird and the
A 1 800-kg pile driver is used to drive a steel I-beam into the ground. The pile driver falls 4.00 m before coming into contact with the top of the beam, and it drives the beam 15.6 cm farther into
What is the average exhaust speed of the engine? This engine is placed in a rocket body of mass 41.5 g. What is the magnitude of the final velocity of the rocket if it were to be fired from rest in
A car's odometer measures the distance from home to school as 4.5 mi. Using string on a map, you find the distance to be 4.7 mi. Which answer do you think is more accurate? What does accurate mean?
An arrow is shot at an angle of θ=45°theta = 45^circ above the horizontal. The arrow hits a tree a horizontal distance D=220mD = 220 ; {rm m} away, at the same height above the ground as it w
Determine the average acceleration in m/s2, using a coordinate system with the x axis in the direction of the car's original motion and the y axis toward the side of the road to which the car skids.
Two converging lenses are separated by 23.00 cm. The focal length of each lens is 12.40 cm. An object is placed 37.00 cm to the left of the lens that is on the left. Determine the final image dista
A jeweler whose near point is 70 cm from his eye uses a magnifying glass as in the figure to examine a watch. The watch is held 4.0 cm from the magnifying glass. Find the angular magnification of th
A person has far points of 5.2 m from the right eye and 6.9 m from the left eye. Write a prescription for the refractive power of each corrective contact lens.
Suppose we have an infinitely long wire carrying a current of 4. It is bent into an L-shape extending into positive infinities along the x- and y- axes. Find the magnitude of the magnetic field at
He walks home after school. If the front of Brian's house is the origin, (a) what is the position of the school, (b) what is his displacement on the walk home, and (c) what is his displacement due t
How does this compare to the ground-level energy of the hydrogen atom? What is the ionization energy of Be3+? How does this compare to the ionization energy of the hydrogen atom?a
A 7.0 kg bowling ball moves at 2.30 m/s. How fast must a 2.00 g Ping-Pong ball move so that the two balls have the same kinetic energy?
In a container of negligible mass, 0.150 kg of ice at 0oC and 0.0800 kg of steam at 100 oC are added to 0.200 kg of water that has a temperature of 40 oC. If no heat is lost to the surroundings, and
Consider an electron confined to a one-dimensional box of length 2.20 angstroms.n For this particle, what is the energy difference, in Joules, between the n=5 and n=4 energy levels?
Observations of a certain galaxy show that stars at a distance of 16 pc from the center of the galaxy orbit a central supermassive black hole at a speed of 200 km/s. Use Newton's form of Kepler's th
Find the semimajor axis of the ellipse. (Hint: Draw a picture showing Sun and the orbits of Earth, Mars, and the spacecraft. Treat the orbits of Earth and Mars as circles.)
Calculate the masses of the two stars in the system (watch your units, keep star masses in Msun units, put P into years and A into AU. OR use the full equation of Newton's version of Kepler's 3rd l