When we observe a distant galaxy whose photons have traveled for 10 billion years before reaching earth, we are seeing that galaxy as it was when the universe was?

A 2kg object is on a spring that is compressed 1.5 meters. if the spring has 2 joules of elastic potential energy, find the spring constant of the spring

Which properties do metalloids share with metals?

You stand 75.0 m away from the launch pad of a model rocket. you watch the rocket rise to an angle of 65.0 degrees. your eye is 1.50 m above the horizontal. What altitude did the rocket achieve

The scientific name for the common house cat is felis demesticus

Which of the following accurately describes properties of valence? A. The greater the number of electrons an atom has to borrow or to lend, the greater the activity of the atom. B.

An object will only change its motion if a force is directly applied to it. is this a true statement?

Janice has just measured the density of an object. Which value is possible? (Density: D = )

Based on how the book describes a heat pump in sec 16.3 how does a heat pump prove law of conservation of energy

When a gas in a container is squeezed to half its volume, its density?

A ballet student with her arms and a leg extended spins with an initial rotational speed of 0.90rev/s. As she draws her arms and leg in toward her body, her rotational inertia becomes 0.80 kg⋅m2 and her rotational velocity is 4.1rev/s.