The dots on an hr diagram represent which of the following?

a. galaxies

b. stars

c. solar systems

d. only main sequence stars

A car accelerates from rest at - 2.40 m/s2. (Include the sign in your answers.) (a) What is the velocity at the end of 3.6 s?

A car is moving at a constant speed along a straight line. Which statement is true about the forces acting on the car? A. The net force acting on the car from all directions is zero. B.

50.0 g of HI is injected into an evacuated 5.00-L rigid cylinder at 340 K. What is the total pressure inside the cylinder when the system comes to equilibrium

Which of the following elements has the highest atomic mass? 1. Helium: 2 protons and 2 neutrons 2. Nitrogen: 7 protons and 7 neutrons 3. Oxygen: 8 protons and 8 neutrons 4. hydrogen: 1 proton and no neutrons

The excerpt is from an article that Roberto read for science class called "Using the Scientific Method to Study Tomatoes." The student performed an experiment to test his hypothesis about sunlight and plant height using two plants.

Which equation expresses the conservation of mechanical energy in a system that involves kinetic energy, gravitational potential energy, and elastic potential energy?

Which of these is an example of temperature changing over time? A. a pan cools off on the stove B. a frozen dinner sits in the freezer C. a mug is at room temperature on the counter D. two glasses of water are filled from the tap and mixed together

A syrup added to an empty container with a mass of 115.25g. When 0.100 pint of syrup is added, the total mass of the container and syrup is 182.48g. Determine the density ... ?

MOST high schools teach biology, then chemistry, then physics. What do you see as some of the disadvantages of the traditional sequence to both students and teachers.

If you break a bar magnet in half, each half