A person in a hot air balloon is flying upwards with its position being given by: H = 0.5t^3 meters. At t= 4 seconds, the person releases a ball. If you take gravity to be -9.8 bj m/s2 • What is the initial velocity of the ball?
• Based on the description, compute the time it takes for the ball to reach the ground.
• What is the the initial height where the balloon was when the person released the ball?

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Antireflective coatings on solar cells are often made by applying a thin film of silicon nitride (sinx), which has an index of refractive of 1.2, on the top of the silicon solar cell, which has a refractive index of about 3.5. however, the sun emits radiation of various wavelengths which the solar cell absorbs, and the antireflective coating can only absolutely minimize the reflection of one of these wavelengths. the coating thickness is chosen to reduce the reflection of green/yellow light (e = 2.2 ev), which is the most intense color in the solar spectrum (shown below). which of the following coatings would minimize reflection of green/yellow light? the answer is 820 nm how? what is the angular width of the central maximum of an electron traveling at 2 x 108 m/s going through a single slit of width 1 mm.

If an electric circuit is not grounded it is best to reach out and touch it to provide the ground a.true or b.false