Neil Armstrong was the first man to walk on the moon. On July 20, 1969, his famous statement, "That's one small step for man, one giant leap for mankind." was received at 10:56 p.m. ( EDT) on Earth. (a) How long I did it take his voice to reach Earth via radio waves? (b) At what time (in EDT) did he utter this statement at the surface of the moon. The distance between the Earth and the moon is 3.85 x 10⁸ m.

A special black material absorbs all light incident upon it. An intense laser beam shines straight up onto a horizontally flat object made out of this material. If the object has an area of 1.0 m² and a mass of 1.0 kg, how much power does the laser need to generate in order to accelerate it upward at a rate that is two times the freefall acceleration of gravity, 2g?

An anstonomer on a planet orbiting the star Deneb wants to differentiate the reflected light by Earth from the light of the Sun. First, consider the area of Earths disk which reflects the Sun's intercepted light. Second, consider the surface area of a sphere with the same radius as Earths orbit around the Sun. Take the ratio of these two areas. Assume the Earths radius is 6400.0 km and is 1.3 x108 km from the Sun.

Find the wavelengths of electromagnetic waves with the following frequencies. (Assume the waves are traveling in a vacuum.) (a) 2.50 ✕ 1019 Hz (Enter your answer in pm.)  pm (b) 6.00 ✕ 109 Hz (Enter your answer in cm.)  cm

A point source emits electromagnetic energy at a rate of (1.0028x10^2) Joules per second. What is the intensity of the electromagnetic radiation (9.97x10^0) m from the source? Express your result with three significant figures in mW/m2.

Part C: Short Answer- Communications 32. Describe a situation where an object is accelerating but its velocity is zero.(2) 33. In designing new aerospace launch shuttles. For the same initial upward velocities, how many times higher will a shuttle travel above the moon surface (g = 1.6 m/s² [down]) than above the surface of Earth? Assume negligible air resistance on Earth.(2) 34. High frequency, very short wavelength Gamma Rays are used to treat some types of cancer. Describe how this is possible. (3) 35. Providing examples of each, differentiate between inertial and noninertial frames of reference.(2) 36. Describe a modern technology that involves the knowledge and usage of electrical and magnetic fields?(3) 37. Looking out a train window, you see a train on the adjacent track. Explain why you think it might be the other train moving when it is really your train that has started to move.(2) 6 of 13

Approximately how long would it take a telephone signal to travel 5.46 x 10^10 m from Earth to Mars ?

(a) Approximately how long would it take a telephone signal to travel 2810 mi from coast to coast across the United States? (Telephone signals travel at about the speed of light.) b) Approximately how long would it take a radio signal to reach the International Space Station (ISS) at an orbital altitude of 350 km?

You are working for SETI, the Search for Extraterrestrial Intelligence. One day, you receive a radio communication from an alien intelligence. Although you cannot understand their language, they have included some photos from an I Love Lucy episode. The photos allow you to determine that it is the episode in which Lucy makes a television commercial on Vitameatavegamin. This episode first aired on CBS on May 5, 1952. Before running to your supervisor to tell him the news, you quickly determine how far away in light-years the alien civilization is. (Enter the maximum possible distance.) light-years Need Help? Read It

An anstonomer on a planet orbiting the star Deneb wants to differentiate the reflected light by Earth from the light of the Sun. First, consider the area of Earths disk which reflects the Sun's intercepted light. Second, consider the surface area of a sphere with the same radius as Earths orbit around the Sun. Take the ratio of these two areas. Assume the Earths radius is 6400.0 km and is 1.3 x108 km from the Sun.