Physics Answers

A sound source of frequency 1000 Hz moves at 40.0 m/s toward a listener who is at rest. What is the apparent frequency heard by the listener? (speed of sound = 340 m/s)

A 10-ft³ vessel of hydrogen at a pressure of 305 psia is vigorously stirred by paddles until the pressure becomes 400 psia. Determined (a) ∆U,and (b) W. No heat is transferred, cv= 2.434 Btu/lb.R

How do I calculate inpedance in a circuit

Determine the weight of a 74-kg man on the moon where the gravitational field is one-sixth that of the Earth’s gravitational force rounded off to nearest hundredths.

What is needed by force to perform work if action of force moving along a direction can perform work?

Charge q1 = 7.00 μC is at the origin, and charge q2 = -5.00 μC is on the x-axis, 0.300 m from

the origin as shown below. (a) Find the magnitude and direction of the electric field at point P,

which has coordinates (0, 0.400) m. (b) Find the force on a charge of 2.00 × 10-8 C placed at �

A 2.96 kg particle has a velocity of (3.00 i hat - 4.06 j) m/s.

(a) Find its x and y components of momentum.

Directions: Compute the charge of the following ions. Show your solutions.

a. Anion with a charge of -3

b. Cation with a charge of +2

c. Anion with a charge of +5

In the middle of the night, you are standing a horizontal distance of 14.0 m from the high fence that surrounds the estate of your rich uncle. The top of the fence is 5.00 m above the ground. You have taped an important message to a rock that you want to throw over the fence. The ground is level, and the width of the fence is small enough to be ignored. You throw the rock from a height of 1.60 m above the ground and at an angle of 56.0o above the horizontal. (a) What minimum initial speed must the rock have as it leaves your hand to clear the top of the fence? (b) For the initial velocity calculated in part (a), what horizontal distance beyond the fence will the rock land on the ground?

If a car drives for 60 km in a Westerly direction, then turns around and drives for 128 km to the East. What is the resultant displacement of the car?