A radio antenna broadcasts a 1.0 MHz radio wave with 29.0 kW of power. Assume that the radiation is emitted uniformly in all directions.

What is the wave's intensity 25.0 km from the antenna?

The answer is 3.69×10⁻⁶ W/m^2

What is the electric field amplitude at this distance?

A 336-kg crate rests on a surface that is inclined above the horizontal at an angle of 17.2°. A horizontal force (magnitude = 405 N and parallel to the ground, not the incline) is required to start the crate moving down the incline. What is the coefficient of static friction between the crate and the incline?

A catapult launches a test rocket vertically upward from a well, giving the rocket an initial speed of 80.8 m/s at ground level. The engines then fire, and the rocket accelerates upward at 4.20 m/s2 until it reaches an altitude of 990 m. At that point its engines fail, and the rocket goes into free fall, with an acceleration of ❝9.80 m/s2. (You will need to consider the motion while the engine is operating and the free-fall motion separately.)

(a) For what time interval is the rocket in motion above the ground? s

(b) What is its maximum altitude? km (

c) What is its velocity just before it hits the ground? m/s

1. Three 1500 Ω resistors are wired in parallel with a 15 V battery. What is the current through each of the resistors?
2. Three 1500 Ω resistors are wired in parallel with a 15 V battery. What is the current through the battery?
3. Can any arbitrary combination of resistors be broken down into series and parallel combinations?
4. Three resistors (110 Ω, 2500 Ω, and 5800 Ω) are wired together in series with a 12 V battery. What is the current through each of the resistors?
5. Three resistors (110 Ω, 2500 Ω, and 5800 Ω) are wired together in parallel with a 12 V battery. What is the current through each of the resistors?

When do the centers of gravity and mass coincide? When they don’t? Explain why is the center of gravity of the Flame Towers (building in Baku, lookup in google) is a bit below their center of mass?

1-Why doesn't the force of gravity change the speed of a satellite in circular orbit?

2-A circularly moving object requires a centripetal force. What supplies this force for satellites that orbit the Earth?

3-A 'geosynchronous' Earth satellite can remain nearly directly overhead in Singapore, but not in San Francisco. Why?

4-True or false: For orbits of greater altitude, the period is longer.

5- Fill in the blank:

____(a)______gathered the data that were used to show that the planets travel in elliptical orbits around the sun___(b)_______discovered the orbits were elliptical.______(c)_______explained them.

Question 4(3pts)

State the definitions of elastic, inelastic, and completely inelastic collisions. Give an example of a situation where the final kinetic energy is greater than the initial value.

An airplane is flying with a velocity of 240 m/s at an angle of 30.0° with the horizontal, as the drawing shows. When the altitude of the plane is 2.4 km, a flare is released from the plane. The flare hits the target on the ground. What is the angle θ?

PLEASE PLUG IN YOUR OWN VALUES FOR THE GIVEN PROBLEM AND SOLVE:

A projectile is fired with an upward aim from a cliff and lands somewhere away and below the cliff. You are asked to find the vertical distance between where the projectile lands and the highest point in the trajectory of the projectile.

Obtain the equation of motion for a 1.25-g mass, at the end of a perfectly elastic spring which, when stretched 3.75 cm from equilibrium and then released from rest, undergoes simple harmonic motion with a period of 0.016667 s. B.) Find the (i) spring constant (ii) maximum velocity and (iii) total energy of the mass. C.) For the above spring find the positions for which the potential energy is one-third the kinetic energy.

Please circle the answer and please make sure that it is true answer.

1-)A physical pendulum consists of a meter stick that is pivoted at a small hole drilled through the stick a distance d from the 50 cm mark. The period of oscillation is 2.24 s. Find d (in cm's).

A Gaussian surface in the shape of a right circular cylinder with end caps has a radius of 10.3 cm and a length of 64.6 cm. Through one end there is an inward magnetic flux of 19.0 μWb. At the other end there is a uniform magnetic field of 2.18 mT, normal to the surface and directed outward. What are the (a) magnitude and (b) direction (inward or outward) of the net magnetic flux through the curved surface?

Please circle the answers and please make sure that it is true answer. Thank you.

A particle executes linear SHM with frequency 0.11 Hz about the point x = 0. At t = 0, it has displacement x = 0.33 cm and zero velocity. For the motion, determine the

(a) displacement at t = 2.2 s, and (b) velocity at t = 2.2 s.

Calculate Madelung constant A for a linear chain and for NaCl crystal numerically with a personal computer by using the screened coulomb potential U = (+/- e^2/ r)e^-(alphar) discuss whar happens when alpha tends to 0