An 8 m long uniform plank of mass 140 kg rests on the side of a pirate ship with 3 meters extended over the edge. How far can a 60 kg prisoner venture past the odge of the ship on the plank before the plank just begins to tip? Please select the correct answer from the choices shown below: A. 1,5 m B. 1.67 m C. 2 m D. 2.33 m Reset Selection
The energy applied to cause vibration can be in the form of air pressure, a stick,a bow, or electricity. A. False B. True
What do.scientists know about the future of the universe? what dark matter is made of why the expansion of the universe is accelerating that stars will eventually burn out causing the universe to become cold and dark that galaxies spin much slower than they should based on visible matter
10. Which of these illustrates how air resistance can change an object's falling speed? A. An astronaut floating in space B. A coin dropped from a building C. A parachute slowing a skydiver D. A boulder rolling off a cliff
What is the center of an atom called? electron cloud proton center photon center nucleus
The first energy shell contains a maximum of __ electrons. Select one: a. 1 b. 2 C. 4 d. 8
4x The statement can be made that atoms and molecules are always in motion. Formulate a reason that solids can exist. A The internal energy of the atoms is not enough to allow the atoms to disassociate from its neighbors. B External energy output is strong enough to allow the atoms to withdraw from its nearest neighbors. C Intermolecular forces are inadequate to allow the atoms to break away from its nearest neighbors. D Activation energy is equivalent to allow the atoms to migrate away from its nearest neighbors.
What does a negative velocity indicate? The object is moving backwards The object is speeding up The object is at rest The object is slowing down
What is the speed of sound in air that students need to remember? 550 meters per second 330 meters per second 250 meters per second 1000 meters per second
How does the speed of sound waves change in different mediums? It only changes in water It only changes in air It remains constant It varies depending on the medium
$\square $ Answer Bank KE: 1000.0 J PE: 3000.0 J KE: 0J $PE:4000.0J$ KE: 2000.0 J PE: 2000.0 J KE: 4000.0 J PE: 0J
Learning Log: How do you think you get something to have more kinetic energy?
If a UV light unit has four lamps in it, and each lamp is 7-watt, it is known as a __ 7-watt unit 28-watt unit 11-watt unit 3-watt unit
10. What is the mass of a meteorite that is traveling towards Earth at $1,760m/s$ with a momentum of $33,400kgm/s$
Where is the energy coming from in the lab (where does it start)? A Potential energy in the Cheeto B Potential energy in the water C Kinetic energy inside the water D Kinetic energy in the Cheeto
What should happen to the temperature of the water? A It stays the same B It goes down C It goes up
9. Your local weather report announces that the barometric pressure is 30.44 inHg. Convert this pressure to psi, atm torr, and Pa.
Express the temperature, 275.18 K in degrees Celsius. $548.33^{\circ }C$ $274.17^{\circ }C$ $2.03^{\circ }C$ $120.88^{\circ }C$ $22.78^{\circ }C$
Hubble's Law has led physicists and astronomers to the hypothesis that the universe is expanding. True False
Newton determined that the force of gravity on an object is proportional to its mass causing its mass to be canceled out (Newton's second law) and resulting in a constant acceleration. If the laws of physics are universal, then Newton should be able to apply his discoveries about gravity on Earth to the motion of the planets in our Solar System. Newton's third law says that for every force there is an equal reaction force in the opposite direction. What does this imply about the force of gravity associated with a person standing on the Earth? Choose one: A. The force of gravity on the person cancels out to zero. B. The Earth's gravity pulls downward on the person but also pushes upward on them. C. The Earth's gravity pulls downward on the person, and the person's gravity pulls upward on the Earth. D. There is twice as much gravitational force on the person than there would be if it weren't for Newton's third law.
