Which of these observations would show a chemical

matter?

choices are

C. Lime juice will burn your tounge

D. Glass will break when it's dropped

Which of the following is not a type of system? Biomedical Ecological Social Biological (not sure if this is physics but it doesn't give me the option to pick science for subject)

Brittany stands at rest on a skateboard. the combined mass of brittany and the skateboard is 62 kg. dave tosses a 3.7-kg pumpkin to brittany, and when she catches it, she and the skateboard begin to roll backward with a speed of 0.16 m/s.

What provides the source of the earth's magnetic field? the north and south poles of the earth. the sun. the ocean's electric currents. the core of the earth.

How high above Earth's surface does the troposphere reach

Two particles are moving along the x axis. Particle 1 has a mass m₁ and a velocity v₁ = + 4.7 m/s. Particle 2 has a mass m₂ and a velocity v₂ = - 6.2 m/s. The velocity of the center of mass of these two particles is zero.

What is a superconductor?

When you drive from the city to a distant farm, the temperature gets because of the?

How do a joule a watt and a Newton relate to each other

Say you want to make a sling by swinging a mass M of 1.9 kg in a horizontal circle of radius 0.042 m, using a string of length 0.042 m. You wish the mass to have a kinetic energy of 15.0 Joules when released.

List three ways that electromagnetic radiation is used to improve our everyday lives.