Q1. an amplifier operating from ± 3 v supplies provides a 2.2 v peak sine wave across a 100 ω load when provided with a 0.2 v peak input from which 1.0 ma peak is drawn. the average current in each supply is measured to be 20 ma. find the voltage gain, current gain and power gain as ratios and in decibels. (10 points) q 2. the input and output voltages of an amplifier are v i = 5 sin ( 1000 π t + 30 ∘ )mv and v o = 400 sin ⁡ ( 1000 π t + 90 ∘ )mv. find the magnitude and phase of the voltage gain of the amplifier. (10 points)

The intensity of a polarized electromagnetic wave is 12 w/m^2. part a) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=0∘ with the plane of polarization? part b) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=30∘ with the plane of polarization? part c) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=45∘ with the plane of polarization? part d) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=60∘ with the plane of polarization? part e) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=90∘ with the plane of polarization?

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up

Visualize the problem and identify special cases first examine the problem by drawing a picture and visualizing the motion. apply newton's 2nd law, ∑f⃗ =ma⃗ , to each body in your mind. don't worry about which quantities are given. think about the forces on each body: how are these consistent with the direction of the acceleration for that body? can you think of any special cases that you can solve quickly now and use to test your understanding later? one special case in this problem is if m2=0, in which case block 1 would simply fall freely under the acceleration of gravity: a⃗ 1=−gj^.