A negatively charged particle is attracted to(1 point) Responses negatively charged particles. negatively charged particles. all particles that are located close by. all particles that are located close by. only particles that are large. only particles that are large. positively charged particles. positively charged particles.
Katie rubs a balloon against her hair. Electrons from her hair travel to the balloon, giving the balloon a negative charge and her hair a positive charge. When the negatively charged balloon is brought near the strands of Katie's hair, they move to get closer to the balloon, without the balloon actually touching them. This shows that (1 point) Responses electric attraction is a force that can act at a distance. electric attraction is a force that can act at a distance. Katie's hair would move in this way with or without the balloon. Katie's hair would move in this way with or without the balloon. particles in the air must be pulling Katie's hair toward the balloon particles in the air must be pulling Katie's hair toward the balloon electric attraction is a force that can only act on contact.The Earth has a magnetic field around it, which is generated by its molten core. This magnetic field exerts a force on compass dials, which are magnets, causing them to align with the Earth's magnetic field. This force on compass dials is an example of a force that _______. (1 point) Responses acts only on contact. acts only on contact. acts at a distance. acts at a distance. acts through particles in the air. acts through particles in the air. needs electricity to act.
The _______ force is a noncontact force that is created by the movement of an electrical charge.(1 point) Responses gravitational gravitational resistance resistance centrifugal centrifugal electromagnetic electromagnetic Nora tied a string around a tennis ball, and then she swung it in a circle in front of her to demonstrate a planet orbiting the Sun. She explained that her hand represented the Sun, the ball represented a planet, and the string kept the ball from leaving the "orbit" around her hand. Why doesn't the string work in the same way as gravity? (1 point) Responses The string only pulls one way; gravity pulls both ways. The string only pulls one way; gravity pulls both ways. The string holding the ball in orbit is a contact force; gravity is a noncontact force. The string holding the ball in orbit is a contact force; gravity is a noncontact force. The string keeps the distance between the bodies the same; gravity makes the distance vary. The string keeps the distance between the bodies the same; gravity makes the distance vary. There is no difference between the two systems. There is no difference between the two systems.Astronauts on the Moon can jump higher than if they were on Earth. This is because (1 point) Responses there is no friction on the Moon there is no friction on the Moon Newton's laws of motion do not apply to the Moon. Newton's laws of motion do not apply to the Moon. the astronauts are less massive on the Moon. the astronauts are less massive on the Moon. the Moon is less massive than the Earth.Imagine an object falling to the Earth. Which of the following most accurately describes the motion of that object?(1 point) Responses It falls toward the center of the Earth. It falls toward the center of the Earth. It falls southward. It falls southward. It falls toward the nearest solid ground. It falls toward the nearest solid ground. Its motion is random as it falls. Its motion is random as it falls.An object has balanced forces acting on it. Which of the following describes the result these balanced forces have on the object?(1 point) Responses It remains at rest or moves at constant speed in the same direction. It remains at rest or moves at constant speed in the same direction. It remains at rest or speeds up in the same direction. It remains at rest or speeds up in the same direction. It speeds up in the same direction or moves at constant speed. It speeds up in the same direction or moves at constant speed. It speeds up in the same direction or slows down.An object's motion changes(1 point) Responses when the forces acting on the object remain balanced. when the forces acting on the object remain balanced. if the object is at rest when a force acts upon it. if the object is at rest when a force acts upon it. when there are no forces acting upon it. when there are no forces acting upon it. if a nonzero net force is applied to the object. if a nonzero net force is applied to the object.A small car is traveling at a speed of 60 mph on the highway. In the next lane, a large passenger bus is traveling at the same speed. Which of the following is true? (1 point) Responses The bus has more kinetic energy than the car. The bus has more kinetic energy than the car. The car and the bus have potential energy, not kinetic energy. The car and the bus have potential energy, not kinetic energy. The car has more kinetic energy than the bus. The car has more kinetic energy than the bus. The car and bus have the same amount of kinetic energy.Which of the following statements about energy is true? I. Kinetic energy cannot be transformed into another type of energy. II. Kinetic energy can be transformed into potential energy. III. Potential energy can be transformed into kinetic energy. IV. Potential energy cannot be transformed into another type of energy. (1 point) Responses II and IV only II and IV only I and III only I and III only II and III only II and III only I and IV onlyThe law of conservation of energy states that(1 point) Responses energy cannot be created and it cannot change form. energy cannot be created and it cannot change form. energy cannot change form and it cannot be destroyed. energy cannot change form and it cannot be destroyed. energy can be created and can be destroyed. energy can be created and can be destroyed. energy cannot be created and it cannot be destroyedThe law of conservation of energy states that(1 point) Responses energy cannot be created and it cannot change form. energy cannot be created and it cannot change form. energy cannot change form and it cannot be destroyed. energy cannot change form and it cannot be destroyed. energy can be created and can be destroyed. energy can be created and can be destroyed. energy cannot be created and it cannot be destroyed_______ energy is defined as stored energy.(1 point) Responses Contained Contained Potential Potential Kinetic Kinetic Dynamic Potential energy that is related to an object's height above the ground is known as ________ potential energy.(1 point) Responses electrical electrical gravitational gravitational chemical chemical elastic elastic Energy is defined as(1 point) Responses the mass of a substance times its acceleration. the mass of a substance times its acceleration. how radioactive a substance is. how radioactive a substance is. the ability to dissolve in water. the ability to dissolve in water. the ability to do work.Which of the following organelles is found in most plant cells, but is never found in animal cells?(1 point) Responses mitochondria mitochondria chloroplasts chloroplasts vacuoles vacuoles nucleiThe Earth is populated mostly by single-celled organisms, such as bacteria. However, there are many multi-celled organisms as well. Which of the following is a multi-celled organism? (1 point) Responses human human flower flower insect insect all of theseThe Earth is populated mostly by single-celled organisms, such as bacteria. However, there are many multi-celled organisms as well. Which of the following is a multi-celled organism? (1 point) Responses human human flower flower insect insect all of theseWhich of the following statements is part of the cell theory? (1 point) Responses Cells are the basic units of living things. Cells are the basic units of living things. All cells come from pre-existing cells. All cells come from pre-existing cells. All living things are made up of one or more cells. All living things are made up of one or more cells. all of these
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