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Q1. A magnifier has a magnification of 7x.
How far from the lens must an object be placed so that its (virtual) image is at the near-point distance of 25 {rm cm}?
Q2. A 1.8 kg ball of putty moving to the right has a head-on inelastic collision with the .50 kg putty ball moving to the left. If the combined blob doesn't move just after the collision, what can you end about the relative speeds of the balls before they collided?
A 140 g air-track glider is attached to a spring. The glider is pushed in 12.00 cm and released. A student with a stopwatch finds that 9 oscillations take 10.0 s.
During 9.93 seconds a motorcyclist changes his velocity from v1,x = -37.3 m/s and v1,y = 14.1 m/s to v2,x =-21.9 m/s and v2,y = 29.3 m/s. Find the components of the motorcycle's average acceleration during this process, aav,x and aav,y.
A 45 dB sound wave strikes an eardrum whose area is 4.1 × 10-5 m2. How much energy is received by the eardrum per second
The left mass (10 kg) has a coefficient of kinetic friction between itself and the table of .25, calculate the contact force that acts between the masses
As the refrigerant passes through the compressor, heat transfer to the surrounding occurs at a rate of 0.32 kJ/s. Determine at steady state the power input to the compressor, in kW.
How many electrons are transferred. What is the smallest thickness of a soap film that would appear black if illuminated with 490 light? imagine there is air on both sides of the soap film.
When blue light of wavelength 440 nm falls on a single slit, the first dark bands on either side of center are separated by 49.0 degrees. Determine the width of the slit
Find the speed of water emerging from the hole if the leak is 2.9 below the surface of the water
With the switch open the ammeter reads 1.00 A. What is the resistance of resistor R2 to an appropriate precision and what is the potential difference across R2 when the switch is open?
A horizontal magnetic field of 1.0 x 10-4 T is at an angle of 30o to the direction of the current in a straight wire 75 cm long. If the wire carries a current of 15 A
A series R-L-C circuit is connected to a 170 Hz ac source that has Vrms=80.0 V. What average power is delivered to the circuit by the source
A 48\Omega resistor is connected across a battery, and a 29mA current flows. What is the battery's emf? What is the internal resistance
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