The resultant of two vectors is the smallest when the angle between them is
Answer: 180°
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Physics
- Salt water is more dense than fresh water. A ship floats in both fresh water and salt water. Compared to the fresh water, the volume of water displaced in the salt water is
- A piece of wood is floating in a bathtub. A second piece of wood sits on top of the first piece, and does not touch the water. If the top piece is taken off and placed in the water, what happens to the water level in the tub?
- One day, while swimming below the surface of the ocean, you let out a number of bubbles of air from your mouth. As the bubbles rise toward the surface, their diameters will
- The SI unit of pressure is
- In the ideal gas formula, temperature must be measured in what unit?
- A rock is suspended from a scale reads 10.0 N. A beaker of water is raised up so the rock is totally submerged in the water. The scale now reads 6.25 N. What is the density of the rock?
- How many atoms are there in a mole of Hydrogen (H2) gas?
- You are originally 1.0 m beneath the surface of a pool. If you dive to 2.0 m beneath the surface, what happens to the absolute pressure on you?
- 50 cm3 of wood is floating on water, and 50 cm3 of iron is totally submerged. Which has the greater buoyant force on it?
- A steel ball sinks in water but floats in a pool of mercury. Where is the buoyant force on the ball greater?
- "An external pressure applied to an enclosed fluid is transmitted unchanged to every point within the fluid" is known as
- How many atoms are there in a mole of Helium (He) gas?
- Substance A has a density of 3.0 g/cm3 and substance B has a density of 4.0 g/cm3. In order to obtain equal masses of these two substances, the ratio of the volume of A to the volume of B will be equal to
- Salt water has greater density than fresh water. A boat floats in both fresh water and in salt water. Where is the buoyant force greater on the boat?
- Atmospheric pressure is approximately
- How many atoms are there in a mole of Helium (He) gas?
- What happens when water at its melting point solidifies to ice without any change in temperature?
- Which of the following is true during a phase change?
- 5000 J of heat is supplied in one minute to 0.06 kg of a liquid at its boiling point of 85°C to convert it completely to vapor. Which of the following expressions gives the heat of vaporization of the liquid?
- How is energy transferred as heat always directed?
- To which of the following is high temperature related?
- In the formula Q= mc(deltaT) , which quantity is measured in units of J/g·°C?
- If two small beakers of water, one at 70°C and one at 80°C, are emptied into a large beaker, what is the final temperature of the water?
- Which of the following physical properties can be used to measure temperature using a thermometer?
- 50 g of ice at 0°C is dropped in a beaker containing 100 g of water at 0°C. What will be the contents of the beaker after 5 hours? Assume that the room temperature is 0°C.
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