A car travels in a flat circle of radius R. At a certain instant the velocity of the car is 20 m/s north, and the total acceleration of the car is 2.5 m/s2 37° south of west. Which of the following is correct?
a. R = 0.40 km, and the car's speed is decreasing.
b. R = 0.20 km, and the car's speed is decreasing.
c. R = 0.20 km, and the car's speed is increasing.
d. R = 0.16 km, and the car's speed is increasing.
e. R = 0.16 km, and the car's speed is decreasing.
b
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You observe a star cluster with a main-sequence turnoff point at spectral type G (the same spectral type as the Sun). What is the approximate age of this star cluster?
A) 10,000 years B) 4.6 billion years C) 10 billion years D) 100 billion years E) 10 million years
A(n) ____ contains two or more atoms that are bound together by exchanging or sharing electrons with each other
a. nucleus b. ion c. proton d. electron cloud e. molecule
A syringe has an inside radius of its barrel of 0.50 cm and at the opening at the end of the needle the radius is 1.0 mm. If a force F is applied to the plunger, what is the force produced at the opening of the needle?
a. 5F b. 25F c. F/5 d. F/25
As an interstellar cloud of hydrogen gas shrinks in size, its temperature increases
A) because thermal energy is converted to radiative energy. B) because kinetic energy is converted to radiative energy. C) because gravitational potential energy is converted to thermal energy.