1. The surface tension in a cup of water is caused by ____.
(1 point)attractive forces between the water and its container
attractive forces between water molecules
adhesive forces between water molecules
adhesive forces between the water and its container
2. The measure of the average kinetic energy of the particles of a substance is the ____. (1 point)temperature
heat
thermal energy
kinetic energy
3. Archemedes’ Principle helps to explain the relationship between ____. (1 point)kinetic energy and density
temperature and density
pressure and density
buoyancy and density
4. A cork is able to float on water because it is ____. (1 point)a crystalline solid
equal in density to water
small in size
less dense than the water
1. b
2. a
3. d
4. d
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b,a, d, d
1b
2a
3d
4d
Trust me they are right
1. b
2. a
3. d
4. d
1. The surface tension in a cup of water is caused by attractive forces between water molecules.
To get this answer, we can recall that surface tension is the property of the surface of a liquid that allows it to resist an external force. We know that attractive forces between molecules are responsible for this property. Given the options, we can eliminate the ones that involve the water container since surface tension is a property of the liquid itself. Thus, the correct answer is attractive forces between water molecules.
2. The measure of the average kinetic energy of the particles of a substance is the temperature.
To determine this answer, we need to understand that temperature measures the average kinetic energy of the particles in a substance. The options include heat, thermal energy, and kinetic energy. Heat refers to the transfer of energy, whereas thermal energy is the total energy of the particles. Kinetic energy specifically refers to the energy of motion, and since average kinetic energy is being measured, the correct answer is temperature.
3. Archimedes' Principle helps to explain the relationship between buoyancy and density.
To solve this question, we should recall that Archimedes' Principle states that the buoyant force experienced by an object submerged in a fluid is equal to the weight of the fluid displaced by the object. Therefore, the relationship being explained is between buoyancy (the upward force experienced) and density (the mass per unit volume of an object or substance). The other options involving kinetic energy, temperature, or pressure do not relate to Archimedes' Principle, so the correct answer is buoyancy and density.
4. A cork is able to float on water because it is less dense than the water.
For this question, it's important to understand that an object will float if it is less dense than the surrounding liquid. A cork is less dense than water, so it is buoyant and able to float. The other options, including being a crystalline solid, equal in density to water, or small in size, do not explain why a cork can float. Thus, the correct answer is less dense than the water.