3.10.23 | Physics Exam

What is the weight of a girl with a mass of 30 kg on Earth in Newtons? *Use 9.81

• 294.3 N
• 291.9 N
• 287.1 N
• 300.4 N

What causes neap tides?

• The relative position of the sun and moon to the earth cancel out their gravitation effect on the tides.

• The relative position of mercury and moon to the earth cancel out their gravitation effect on the tides.

• The relative position of the sun and moon are on opposite sides of the earth, causing minimal tides.

During a solar eclipse..

• The moon is between the sun and the earth.

• The earth is between the sun and the moon.

• Mercury is between the sun and the earth.

• The moon is on the other side of the sun.

What causes the changes in seasons?

• The sun is closer to earth in the summer months.

• When the earth's axis points towards the sun, it is summer for that hemisphere.

• Seasons are random and not predictable.

The breakup of a larger nucleus into two or more smaller nuclei is ____________________.

• Fission
• Fusion
• Half Life
• Conservation

Why are alpha particles easier to stop by materials than beta particles?

• They are larger
• They are weaker
• They are negatively charged
• They are slower

Fill in the blank(s): Each different isotope has the same number of ____________________ and a different number of ____________________.

• Protons, Neutrons
• Neutrons, Protons
• Protons, Electrons
• Electrons, Protons

An atom becomes radioactive when it's nucleus becomes unstable. This happens because:

• Too many protons in the nucleus cause them to repel rather than attract to the neutrons.
• Too many electrons orbiting the atom pull protons away from the neutrons in the center
• Too many neutrons in the nucleus cause the particles to repel each other
• All of the above

When a light source moves away from us, what is the consequent stretching out of wavelengths known as?

• Blueshift
• Redshift
• Coriolis effect
• Color effect

A star stays on the main sequence as long as

• It fuses hydrogen into helium
• It is any of the colors between blue and red
• It has nuclear fusion of heavy elements
• All of the above