Which element comes first in a chemical formula?

A-Those with positive oxidation numbers.

B-Those with negative oxidation numbers.

C-The first element is always a metal.

D-The first element is always a nonmetal.

15. The frequency of a wave is measured in which of the following units?

A hot air balloon is rising vertically with a velocity of 10.0 feet per second. A very small ball is released from the hot air balloon at the instant when it is 960 feet above the ground. Use a (t) = -32 ft/sec2 as the acceleration due to gravity. 1.

A horizontal pipe of diameter 0.937 m has a smooth constriction to a section of diameter 0.5622 m. The density of oil flowing in the pipe is 821 kg/m^3 .

How much heat is needed to raise the temperature of 10g of water by 16°C?

A remote-controlled plane has a mass of 0.386 kg and flies in a circle with a radius of 75 m. The centripetal force on the plane is 4.0 N. What is the tangential speed of the plane?

In what way would a digital thermometer be preferable to those from a liquid-based thermometer? Digital thermometer readings are easier to use when performing calculations.

Why does the core of the sun contain more helium and less hydrogen than the surface of the sun?

What happens to a light ray passing through the center of a lens?

A spider crawling across a table leaps onto a magazine blocking its path. The initial velocity of the spider is 0.870 m/s at an angle of 35.0° above the table, and it lands on the magazine 0.0770s after leaving the table. Ignore air resistance.

A force of 5 N accelerates an object. The object's mass is 50 g. What is the acceleration of the object? (Formula: F=ma)