An arrow is shot vertically upward from the top edge of a 300 m cliff with a speed of 50 m/s, and it just misses the edge on the way down. What is its speed when it hits the base of the cliff? [91.5 m/s]

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When a baseball player catches a baseball, the glove "gives" or moves backward. How does this movement affect the change in momentum of the baseball? The change in momentum increases because the impact time increases. The change in momentum decreases because the force decreases. The change in momentum stays the same because the ball still comes to a stop. The change in momentum depends on the initial speed of the ball and the time to stop.
A wagon is pulled at a speed of 0.40metets/seconds by a horse exerting an 1,800 Newton's horizontal force. what is the power of this horse?
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Plugging a lamp into an electrical outlet gives the lamp a source ofa. current. b. voltage. c. resistance. d. all of these

Which of the following is true of salt lakes

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Since you did not give the choices, I'll just have to state what are salt lakes.
A salt lake also known as saline lake, is a landlocked body of water that has a concentration of salts.
These salts are typically sodium chloride and other dissolved minerals significantly higher than most lakes. In some cases, salt lakes have a higher concentration of salt than sea water which are also termed as hypersaline lakes.

Answer is C. The water flowing in to salt lakes contains minerals.

I had it on a test.

The method of heat transfer by which the sun warms the earth isA) conduction
B) convection
C) radiation
D) solaration

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the heat transfer by the sun that warms the earth is called radiation.

Which of the following is true of iambic pentameter?a. It has 14 syllables per line.
b. It is divided into a pair of fives.
c. It has a stressed syllable followed by an unstressed syllable.
d. It is present in both Italian sonnets and Shakespearean sonnets.

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a). No. "Pentameter" has 10 syllables per line.

b). No. This choice doesn't mean anything.

c). No. This is the description of a trochee, not an iamb.

d). I don't know anything about Italian sonnets. But I do know that
Shakespeare used iambic pentameter, and the other choices have
been eliminated, so I'll go with this one. (the "multiple-guess" method)

Magma that cools and crystallizes on Earth's surface forms A. quartz.
B. marble.
C. intrusive rocks.
D. extrusive rocks.

Answers

The correct answer is:

D. Extrusive rocks.

The explanation:

when extrusive igneous rocks form when magma reaches the Earth's surface a volcano and cools quickly. Most extrusive (volcanic) rocks have small crystals. Examples include basalt, rhyolite, andesite, and obsidian.

The answer is D. Extrusive igneous rocks form when magma reaches the Earth's surface a volcano and cools down very quickly. This forms many small crystal on the rock.

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study it? I tried the answer "b." and that's not the right answer I guess.a. The cosmological principle makes assumptions that provide scientific guidelines to enable its study.

b. Physicists develop mathematical equations to determine its physical nature.

c. The Big Bang theory provides the scientific guidelines to enable its study.

d. Scientists are able to gather samples from NASA.

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Answer: a. The cosmological principle makes assumptions that provide scientific guidelines to enable its study.

Explanation:

Scientists cannot physically test their ideas about the origin of the universe but they use cosmological principles to study. Some aspects of the assumptions made on the basis of cosmological principle can be tested. Whatever was formed at the origin of the universe is present around us. Studies are made on them and conclusions are drawn.

Cosmological principle states that on larger scale, the universe is homogeneous and isotropic. This means in which ever direction we look, its the same and there is no preference to any particular direction to make observations.

There are numerous theories associated with the origin of the universe but none can be proved. The theories can only be studied based on the assumptions made using the cosmological principle.

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study it?

a. The cosmological principle makes assumptions that provide scientific guidelines to enable its study.

Hope this helps.

A 1451 kg car is traveling at 48.0 km/h. How much kinetic energy does it possess? K.E. =

Answers

   Kinetic energy = (1/2) (mass) (speed)²

BUT . . . in order to use this equation just the way it's written,
the speed has to be in meters per second. So we'll have to
make that conversion.

KE = (1/2) · (1,451 kg) · (48 km/hr)² · (1000 m/km)² · (1 hr/3,600 sec)²

   = (725.5) · (48 · 1000 · 1 / 3,600)² (kg) · (km·m·hr / hr·km·sec)²

   = (725.5) · ( 40/3 )² · ( kg·m² / sec²)

   = 128,978 joules (rounded)

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