A projectile is fired from ground level with a speed of 150 m/s at an angle 30° above the horizontal on an airless planet where g = 10.0 m/s2. What is the horizontal component of its velocity after 4.0 s?
A) 38 m/s B) 75 m/s C) 150 m/s D) 130 m/s E) 35 m/s
D
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An inventor develops a stationary cycling device by which an individual, while pedaling, can convert all of the energy expended into heat for warming water. How much mechanical energy is required to increase the temperature of 300 g of water (enough for 1 cup of coffee) from 30°C to 90°C? (1 cal = 4.186 J, the specific heat of water is 4186 J/kg • °C)
a. 94,000 J c. 5400 J b. 75,000 J d. 14 J
Ozone is a pollutant of city air caused by auto emissions. Therefore ozone is bad for Earth
a. True b. False Indicate whether the statement is true or false
Pluto is found within the
A) Oort cloud. B) Kuiper belt. C) asteroid belt. D) orbit of Neptune.
What is the base metal for superalloys that are used for the highest temperature applications?
(a) Nickel (b) Iron (c) Aluminum (d) Titanium