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
Convert 810 mmHg to kPa. 6.16E5 kPa 760 kPa 1.14 kPa 107.9 kPa
Which one is Newton's second law of motion? The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object. The acceleration of an object as produced by a net force is inversely proportional to the magnitude of the net force, in the same direction as the net force, and directly proportional to the mass of the object. $F=\frac {m}{a}(\frac {m}{s^{2}})$ $F=\frac {a}{m}(N)$
What is the best estimale of the mass of a cupcoke? A 80 pounds 80 grams C 80 tons kiloaroms
Describe how voltage, current and resistance behave in a parallel circuit. Edit View Insert Format Tools Table $\square $
A lead ball has a mass of 55 .0 grams and a density of $11.4g/cm^{3}$ What is the volume of the ball? 4.82 mL 0.207 L 4.82 L 0.207 mL none of the above
Question 3. Three unmarked bar magnets are tested in pairs at their ends. The following observations are made: - Magnet A and Magnet B attract each other. - Magnet A and Magnet C repel each other. - Magnet B and Magnet C repel each other. Which of the following statements can be determined from these results alone? A. Magnets A and B have like poles near each other. B. Magnets A and C have like poles near each other. C. Magnets B and C have unlike poles near each other. D. All three magnets have the same pole at one end.
black holes? Gravity Normal Friction Applied What do we call the center of a black hole? Accretion Disc Event Horizon Singularity Black Point What force of physics causes nebulas to turn into stars, and later stars into 1 point 1 point
How was viscosity measured in the "Viscosity" lab? directly with a spring scale directly with a viscosity meter indirectly by measuring the distance a liquid flowed in a given time indirectly by measuring the volume of honey
You're driving down a highway late one night at $20m/s$ when a deer steps onto the road 35 m in front of you. Your reaction time before stepping on the breaks is 0.50 s, and the maximum deceleration of your car is $10m/s^{2}$ How much distance is between you and the deer when you come to a stop? 10 m Om 5.0 m 35 m 30 m
Match the items. a. Disturbance moves perpendicular to the direction of the wave b. Ocean Wave c. Sound d. Light e. Disturbance moves in the same direction as the wave 1. Surface Wave 2. Mechanical Wave 3. Electromagnetic Wave 4. Longitudinal Wave 5. Transverse Wave
