How is a surf formed?

Suppose you increase your walking speed from 5 m/s to 12 m/s in a period of 2 s. what is your acceleration?

How many significant digits are in 0.3500

A simple pendulum with length 1.6 m and mass 21 kg is pulled 20◦ from the vertical and released. If it is allowed to swing until it comes to rest, how much energy was converted into heat? The acceleration of gravity is 9.8 m/s 2.

Describe the climate in the desert.

That's because helium molecules are not packed together as densely as air molecules are. It is this simple reason that helium balloons float in the air.

Which of these is not a source of the shock waves that lead to protostars?

Which kind of information is known about a person if that person's DNA is in a database? A. how old the person is B. where the person was probably born C. some diseases the person might have D. whether the person is likely to commit a crime

A science teacher ran a marathon. After the race she showed her students the silver blanket she was given to keep her warm. A group of students investigated how the colour of the blanket affected how much infrared radiation is absorbed

Students asked to measure the temperature of a reaction beaker recorded the following temperatures. 103.7°C, 108.4°C, 105.8°C, 104.6°C The actual temperature is 105.1°C. Which measurement is the most precise

Two atoms that are isotopes of one another must have a different number of what? electrons neutrons protons all particles