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Janessa Cantu
Physics
7. A box is pulled straight across the floor at a constant speed. It is pulled with a horizontal force of 48 N.
a. Find the net force (in N) on the box.
b. Find the force of friction (in N) from the floor on the box.
c. The person pulling on the box stops pulling and the box comes to a rest. Find the force of friction (in N) on the box when at rest.
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Tarzan
Physics
Multiple Select
Which of the following discoveries are attributed to Johannes Kepler? Select all that apply.
The orbits of the planets are ellipses.
The earth is round.
Gravitational forces govern planetary motion.
All planets move in elliptical orbits with the sun at one focus.
A line connecting a planet to the sun sweeps out equal areas in equal time periods.
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Isabella Huber
Physics
The force exerted by a machine is called the output force.
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Janiya Aguirre
Physics
Describe an experiment to determine the size of a molecule.
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Luciana Flores
Physics
In an action-adventure film, the hero is supposed to throw a grenade from his car, which is going 99.0 km/h, to his enemy's car, which is going 124 km/h. the enemy's car is 16.9 m in front of the hero's when he lets go of the grenade.
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Aron Duarte
Physics
When baking soda and vinegar are mixed together bubbles form and the vinegar and baking soda are changed into new chemicals. this is an example of-
A) a physical change
B) a chemical change
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Zayden Davila
Physics
Which of the following is an illuminated object?
A. the sun
B. a flashlight
C. a firefly
D. the moon
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Mara Freeman
Physics
If the motor in a geared appliance has a rated speed of 3600 rpm and a gear ratio of 6 to 1 the driven gear will turn at speed of
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Bria
Physics
Materials that are poor conductors of thermal energy are called ...
Materials that are good conductors of thermal energy are called ...
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Karla Branch
Physics
Which of these is an example of qualitative observation?
A. the atomic number of ironnis 26
B. iron nails are attracted to the magnet
C. iron is located in the fourth period of the periodic table
D. two-thirds of iron is located in the body is found in hemoglobin
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Arabella
Physics
Earth is approximately 4.5 billion years old. Is it likely that any of the rocks that were on Earth's surface when it first formed are still in existence? A. No, most of Earth's magma did not solidify until 1 billion years ago. B. Yes, Earth's surface has changed very little since Earth was first formed. C. No, rock material is constantly recycled on Earth's surface through the rock cycle. D. Yes, rocks are very hard and should be able to survive for 4.5 billion years.
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Nikhil Freeman
Physics
A small car collides with a large truck. Is the magnitude of the force experienced by the car greater than, less than, or equal to the magnitude of the force experienced by the truck? a. less than b. equal to c. greater than
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Harley
Physics
What's the population of people with six packs
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Andreas Reynolds
Physics
With certain exceptions, Class E airspace extends upward from either 700 feet or 1,200 feet AGL to, but does not include, A) 14,500 feet MSL. * B) 18,000 feet MSL. C) 10,000 feet MSL.
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Ariel Odonnell
Physics
We wrap a light, nonstretching cable around a 10.0 kg kg solid cylinder with diameter of 38.0 cm cm. The cylinder rotates with negligible friction about a stationary horizontal axis. We tie the free end of the cable to a 14.0 kg kg block and release the block from rest. As the block falls, the cable unwinds without stretching or slipping. How far will the mass have to descend to give the cylinder 510 J of kinetic energy?
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