Answer:
Bar graph
Explanation:
each day collects data so a bar graph would work.
Wind or gravitational pull. A wave is made by friction between wind and the water’s surface. Waves can also be made by the sun and moon’s gravitational pull on the earth.
Answer:
The volume of an aluminum cube is 0.212 cm³.
Explanation:
Given that,
Edge of cube = 4.00 cm
Initial temperature = 19.0°C
Final temperature = 67.0°C
linear expansion coefficient
We need to calculate the volume expansion coefficient
Using formula of volume expansion coefficient
Put the value into the formula
We need to calculate the volume
The change temperature of the cube is
Put the value into the formula
We need to calculate the increases volume
Using formula of increases volume
Put the value into the formula
Hence, The volume of an aluminum cube is 0.212 cm³.
Answer:
Strong nuclear force is 1-2 order of magnitude larger than the electrostatic force
Explanation:
There are mainly two forces acting between protons and neutrons in the nucleus:
- The electrostatic force, which is the force exerted between charged particles (therefore, it is exerted between protons only, since neutrons are not charged). The magnitude of the force is given by
where k is the Coulomb's constant, q1 and q2 are the charges of the two particles, r is the separation between the particles.
The force is attractive for two opposite charges and repulsive for two same charges: therefore, the electrostatic force between two protons is repulsive.
- The strong nuclear force, which is the force exerted between nucleons. At short distance (such as in the nucleus), it is attractive, therefore neutrons and protons attract each other and this contributes in keeping the whole nucleus together.
At the scale involved in the nucleus, the strong nuclear force (attractive) is 1-2 order of magnitude larger than the electrostatic force (repulsive), therefore the nucleus stays together and does not break apart.
Average speed = distance travelled / time used