Which of the following trips would consume more fuel for a given spacecraft?
1.a trip from the Earth to the Moon
2.a trip from the moon to the Earth
3.They both require the same amount of fuel.
4.It is impossible to determine.
1
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A racecar driver steps on the gas, and his racecar travels 20 meters in 2 seconds starting from rest. The acceleration of the racecar is __________
Fill in the blank(s) with correct word
The San Andreas fault is still active today as the northwest moving
A) North American Plate grinds against the southwest moving Pacific Plate. B) Pacific Plate grinds against the southwest moving North American Plate.
Which of the following is an example of a chemical change? water freezing into ice crystals breaking a glass window gasoline being used in the engine of a car producing exhaust aftershave or perfume on your skin generating a smell a piece of metal expanding when heated, but returning to original size when cooled
1. gasoline being used in the engine of a car producing exhaust 2. water freezing into crystals 3. aftershave or perfume on your skin generating a smell 4. a piece of metal expanding when heated, but returning to original size when cooled 5. breaking a glass window
An alpha particle is a nucleus of helium. It has twice the charge and four times the mass of the proton
When they were very far away from each other, but headed toward directly each other, a proton and an alpha particle each had an initial speed of 0.0030c, where c is the speed of light. What is their distance of closest approach? Hint: There are two conserved quantities. Make use of both of them. (c = 3.00 × 108 m/s, k = 1/4??0 = 8.99 × 109 N ? m2/C2, e = 1.60 × 10-19 C, mproton = 1.67 × 10-27 kg) A) 2.1 × 10-13 m B) 3.3 × 10-13 m C) 2.6 × 10-13 m D) 2.9 × 10-13 m