A football is thrown upward at a 30.0° angle to the horizontal. To throw a 40.0-m pass, what must be the initial speed of the ball?
What will be an ideal response?
21.3 m/s
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A star's ________ parallax is found by using the spectral lines to estimate the spectral class and luminosity of distant stars
Fill in the blank(s) with correct word
A projectile that is fired vertically at 8 km/s from Earth's surface will
A) go into circular orbit about Earth. B) rise and fall back to Earth's surface. C) follow an uncertain path. D) escape from Earth.
A Young's double slit has a slit separation of 1.65 × 10^?5 m on which a monochromatic light beam is directed. The resultant bright fringes on a screen 1.10 m from the double slit are separated by 2.25 × 10^?2 m. What is the wavelength of this beam? (1 nm = 10?9 m)
a. 6.90 nm b. 205 nm c. 337 nm d. 338 nm e. 408 nm
Ozone is a pollutant
a. in the stratosphere. b. near ground level. c. in nitric-acid-rich polar stratospheric clouds. d. in chlorine gas near Earth's surface. e. that can be used as fertilizer on farm fields.