When do both hemispheres receive the same amount of the sun's energy?

I am having major trouble calculating the average speed for things. An example of a question would be, Rachel travelled 240 km in 4 hours by train and then travelled 120 km in 3 hours by car and 3 km in 1/2 hour by cycle.

The largest and the smallest balls used in the experiment are with diameter 9.52 mm, and 2.38 mm respectively. For a glycerin with viscosity 1.0 Pa.

Does the speedometer of a car read average speed or instantaneous speed? how do you know?

Give two examples of spatial interference which can be easily observed.

The pressure inside a water droplet is higher than the surroundings, this is related to surface tension.

A block accelerates at 3.7 m/s2 down a plane inclined at an angle 27.0. Find μk between the block and the in- clined plane. The acceleration of gravity is 9.81 m/s2.

What does the doppler effect tell astronomers about the universe

All group I metals react with H2O to a form a metal hydroxide and hydrogen gas. Which of these will react the fastest?

In transverse waves, the medium moves perpendicular to the direction of energy transport. true false

A horse is running at 12m/s accelerated to 38m/s in 10 seconds. What is the horses acceleration.