Answer
Given,
Time period of star,T = 3.37 x 10⁷ s
Radius of circular orbit,R = 1.04 x 10¹¹ m
a) Angular speed of the planet
b) tangential speed
v = 1.94 x 10⁴ m/s
c) centripetal acceleration magnitude
a = 3.62 x 10⁻³ m/s²
<span>A physical change is any change that alters the form or appearance of a substance but does not change it into another substance
-Some of the physical properties may be altered, but the chemical composition stays the same
-Examples: Bending, Crushing, Cutting, Melting, Freezing, Boiling</span>
Answer:
b 2 only
Explanation:
The mass of an electron is 9.10938356 × 10⁻³¹ kilograms while the mass of a proton is 1.6726219 × 10⁻²⁷ kilograms. It can be seen that a proton is heavier than an electron.
Atoms do not always have the same number of neutrons and protons. For, example ¹³C has 6 protons and 7 neutrons.
Atoms do have most of the mass concentrated at the center called the nucleus. The nucleus has protons and neutrons. As protons have positive charge and neutrons have no charge the nucleus has a positive charge.
Answer:
B) Blackbody radiation
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Answer:
Explanation:
The DNA polymerase used in PCR reaction usually can tolerate high temperature (94degree celcius), the temperature necessary to separate two complementary strands of DNA in a test tube.
If PCR goes through 72degree celcius, which is the temperature optimum for taq polymerase. It starts the extension process where taq polymerase will work away from the primer provided and generated a new DNA strand.
If PCR goes through 50degree celcius, it is annealing temperature. It is related to the melting temperature of the primers and must be determined for each primer pair used in PCR.
