| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.15 |
| Score | 0% | 63% |
Reproductive haploids are also known as:
ovum |
|
sperm |
|
gametes |
|
diploids |
Reproductive (haploid) cells known as gametes have half as many (23) pairs of chromosomes as normal (diploid) cells. When the male gamete (sperm) combines with the female gamete (ovum) through meiosis to form a zygote, each gamete supplies half the chromosomes needed to form the normal diploid cells.
Which of the following is not a characteristic of the Sun?
formed 2.6 billion years ago |
|
is composed of hydrogen and helium |
|
makes up over 99% of the mass of the solar system |
|
is a yellow dwarf star |
The Sun is a G-type main-sequence star (G2V) but is informally known as a yellow dwarf star. Composed of 73% hydrogen and 25% helium, the hot plasma that makes up the Sun reaches 9,900°F (5,505°C) at the surface. It formed approximately 4.6 billion years ago and makes up 99.86% of the mass in the solar system.
The energy posessed by a thrown baseball is an example of what kind of energy?
gravitational |
|
transitional |
|
kinetic |
|
potential |
Kinetic energy is the energy posessed by a moving object. Potential energy is stored energy in a stationary object based on its location, position, shape, or state.
Which of the following is the formula for power?
\(P = \vec{w}t\) |
|
\(P = w t\) |
|
\(P = {\vec{w} \over t}\) |
|
\(P = {w \over t}\) |
Power is the rate at which work is performed or work per unit time: \(P = {w \over t}\) and is measured in watts (W).
The energy posessed by a ball on the window ledge of a tall building is an example of what kind of energy?
kinetic |
|
gravitational |
|
inherent |
|
potential |
Kinetic energy is the energy posessed by a moving object. Potential energy is stored energy in a stationary object based on its location, position, shape, or state.