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A beam of light in a particular medium by any optical means. Explain why it is still possible to set fire to a piece of paper using magnifying glass to focus the sun's rays.
A skier starts down a frictionless 32° slope. After a vertical drop of 28 m, the slope temporarily levels out, then drops at 20° an additional 41 m vertically before leveling out again. Wha
A car is traveling at a constant speed of 31.1 m/s on a highway. At the instant this car passes an entrance ramp, a second car enters the highway from the ramp. The second car starts from rest and
The mass of an electron is 9 x 10-31 kg. The mass of a proton is 1.7 x 10-27 kg. The proton and electron are about 1.0 x 10-10 m apart in a hydrogen atom. What force of gravitation exists between t
Describe one possible economic impact of redox reductions. How might that impact be lessened?
A car drives around a curve with radius 390 m at a speed of 33 m/s. The road is not banked. The mass of the car is 1600 kg. (a) What is the frictional force on the car?
A rifle is aimed horizontally at a target 54 {rm m} away. The bullet hits the target 2.0 {rm cm} below the aim point. What was the bullet's speed as it left the barrel?
A particle of mass m is constrained to move between two concentric impermeable spheres of radii r = a and r = b (a < b). There is no other potential. Calculate the ground state energy and the nor
A hiker shouts toward a vertical cliff 465 m away. The echo is heard 2.75 s later. (a) What is the speed of sound in air there? (b) The wavelength of the sound is 0.75 m. What is the frequency of t
A 30 g car rolls from a hill 12 cm high and is traveling at 154 cm/s as it travels along a 275 cm horizontal track. What is the momentum of the car?
Vector B has a magnitude of 43 and is pointing at an angle of 38 degrees south of west. Find the magnitude and direction of A+B.
A coil is wrapped with 647 turns of wire on the perimeter of a circular frame (of radius27 cm). Each turn has the same area, equal to that of the frame. A uniform magnetic field is directed perpendi
The sensor on the torso of a crash-test dummy records the magnitude and direction of the net forceacting on the dummy. If the dummy is thrown foward with a force of 130 N while simultaneously being
What is the type of beam of light produced by a lamp placed at the focal point of a converging lens
The brakes of a car moving at 14 m/s are applied, and the car comes to a stop in 4 s. What was the car's acceleration?
What should the banking angle of the curves be so that the force of the pavement on the tires of the car is in the normal direction? (Hint: What does this requirement tell you about the frictional f
The magnitude of each force is 251 N, the force on the right is applied at an angle 41 degrees and the mass of the block is 24 kg. The coefficient of friction is 0.134. the acceleration is 9.8. what
A galvanometer whose full scale current is 150.0 amps and coal resistance is 75.0 ohms is used with a 1.50 ohms shunt resistor to make an ammeter. What is the largest current which can be measured
A 0.32kg object is attached to a spring constant 165N/m so that the object is allowed to move on a horizontal frictionless surface. The object is released from rest when the spring is compressed 0.
An infinite cylinder of radius a, with dielectric constant 0 placed along the z-axis in a region. Find the bound charge density on the surface of the cylinder.
Orange light (λvacuum = 614 nm) shines on a soap film (n = 1.29) that has air on either side of it. The light strikes the film perpendicularly. What is the minimum thickness of the film for w
Rank the magnitudes of the forces exerted on the following particles from largest to smallest. In your ranking, display any cases of equality. (Use only ">" or "=" symbols. Do not include any pa
A coin is placed 15.0 cm from the axis of a rotating turntable of variable speed. When the speed of the turntable is slowly increased, the coin remains fixed on the turntable until a rate of 32 rpm
An ocean liner leaves New York City and travels 45.0° north of east for 241 km. How far east and how far north has it gone? In other words, what are the magnitudes of the components of the ship'
A speed skater moving across frictionless ice at 8.80 {rm m/s} hits a 4.30-m-wide patch of rough ice. She slows steadily, then continues on at 5.20 {rm m/s}. What is her acceleration on the rough i