In science, theories tend to be ______________________ than hypotheses. Answers: A) more speculative B) more empirical C) less scientific D) more experimental E) broader in scope
Answers
Answer:
More experimental.
Explanation:
A hypothesis is formulated on the basis of some observed, but unexplained behavior. It is usually preceded by an exclamation from the researcher of "What the heck? Did you see that? It went up and turned blue, when it should have gone sideways and turned red."
The observed behavior was unexpected, so the researcher wants to know why. The first place to start is with an hypothesis: an explanation of what might be happening. It must be a "testable" hypothesis - an explanation that provides an avenue for testing whether the hypothesis may contain some truth. E.g., the lab tech created sufficient momentum in the sample to make it react when he/she moved it from the table to the cabinet.
This can be tested. Just do the same experiment but control movement of the sample. If the reaction does NOT occur under the new conditions, then one might advace the observation as a theory. Ni=ot proven, but the data are consistent with the hypothesis. A theory is based on some level of experimental results, to move it up from an hypothesis.
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Answers
Answer:
Explanation:
* For cylinders, it is unique. Since you have two circular bases, you take half the mass in the formula:
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Answer:
778 J
Explanation:
Rotational energy is:
RE = ½ Iω²
For a solid cylinder I = ½ mr².
Rolling without slipping means ω = v/r.
RE = ½ (½ mr²) (v/r)²
RE = ¼ mv²
Plug in values:
RE = ¼ (34.5 kg) (9.5 m/s)²
RE ≈ 778 J
Round as needed.
Answers
Answer:
60J
Explanation:
friction is the opposition to the motion of an object. Before a body can be set in motion, part of the energy or work-done must be used to overcome friction.
While kinetic energy is the energy associated with a body due to its motion.
Since friction tends to oppose the motion of a body,when a body start to move, some of the energy applied to the body to cause its motion is converted to heat due to friction.
Hence if a work-done of 100J is applied to a body that requires 40J of the work to overcome friction, the total change in the kinetic energy can be expressed as
B. Epoch, period, eon, era
C. Era, eon, period, epoch
D. Epoch, period, era, eon
Answers
Answer:
D. Epoch, period, era, eon
Explanation:
An eon refers to the largest division of time in Earth's history used on the geological time scale. The current eon is divided into three eras. the current era is divided into three periods and the current period is divided into two epochs, reaching the Holocene, which is the current geological epoch.
B. is the correct answer.
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p(0.5 m^3)/(20+273 K) = pv2/(45+273 K)
find v2
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The first dental x-ray film was used by Dr. Frank Vanwoert.
Answers
Answer:
0.0238 centimetre
Explanation:
multiply the length value by 100