PHYSICS HIGH SCHOOL

A cannon tilted upward at θ = 30 ∘ fires a cannonball with a speed of 94 m/s .

Answers

Answer 1
Answer:

Answer:

i think 30

Explanation:

because the 0-30

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What is the term for loops or sheets of glowing gas ejected from active regions on the solar surface?

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Answer:

Solar prominences

Explanation:

Displacement is the change in velocity of an object.

True or false

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Words less true are seldom if ever spoken.
False, it is the change in distance. Chance in velocity would be Δv

What is the frequncy of a wave that has a speed of 8m/s and a wave length of 2?

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v = f \times λ

v = 8m/s

λ = 2

f = v \div λ

f = 8 \div 2

f = 4hz

If my final exam is worth 30% and my class average is 80, what do I need to get to pass the exam?

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You haven't told us what the passing percentage is on the exam,
or what the passing percentage is for the semester, or any of that.

Select all that apply. Which statements are supported by the second law of thermodynamics? The usable energy in the universe is decreasing. The usable energy in the universe is increasing. The energy of the universe is being destroyed. The entropy of the universe is increasing.

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The statements supported are:

- The usable energy in the universe is decreasing.
- The entropy of the universe is increasing.

The second law of Thermodynamics establishes that in each energy convertion, in an isolate system, a part of energy is converted into heat (unusable energy) and the entropy of the system increase.

Answer:

a and d

Explanation:

Validity is __________.a. concerned with the relationships of random error with systematic error. b. equal to the true score plus the systematic error. c. equal to the true score plus systematic error minus random error. d. concerned with the extent to which differences in scores reflect true differences in the characteristic. e. concerned with the extent to which differences in scores reflect instability in the measurements.

Answers

Answer: the correct answer is option d.

Explanation:

Validity is concerned with the extent to which differences in scores reflect true differences in the characteristic.

Answer:

d. concerned with the extent to which differences in scores reflect true differences in the characteristic.

Explanation:

Validity is the level of accuracy of a measurement under research or test. A measurement is said to be valid if its result is closely related to real world values. Validity in research shows how sound one's research is. In data it means getting a true representation of the data a researcher is claiming to measure. To measure validity, the measurement must have internal consistency and good test-retest reliability.

Types of validity.

Validity can be content, construct, face and criterion.

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One cubic foot (1 ft3 ) of seawater weighs about 64 pounds. Suppose you pour one cubic foot of seawater into a light plastic bag, tie the bag closed with no air bubbles inside, and lower it into the ocean via a light attached string. When the bag of seawater is completely submerged, how much force do you have to exert on the sting to hold it up: a. 0 lbs b. 32 lbs c. 64 lbs d. 128 lbs e. You have to push it down because it tends to come up. Please circle your answer and explain your reasoning.
In a given circuit, the supplied voltage is 1.5 volts. One resistor is 3 ohms and the other is 2 ohms. Use Ohm's law to determine the current in the circuit. 0.3 amps 1.5 amps 7.5 amps 3.3 amps The purpose of a fuse or circuit breaker is _____. to speed up the current to slow down the current to stop current that is flowing too fast to stop current that is flowing too slow