What is the amount of matter in an object is known as

In an old house, the heating system uses radiators, which are hollow metal devices through which hot water or steam circulates. In one room the radiator has a dark color (emissitivity = 0.830). It has a temperature of 64.1 oC.

Which of the following is the densest layer of the solid Earth? atmosphere crust mantle core

Why are most cells 70 percent water?

An individual who has had chicken pox rarely gets this disease again. This situation is an example of 1) biological control. 3) active immunity 2) negative feedback 4) passive immunity

Which type of energy is emitted from earth to the atmosphere? * ?

What is a Rift Valley?

Double the resistance of the resistor by changing it from 10 Ω to 20 Ω. What happens to the current flowing through the circuit?

Who would most likely be required to work with sodium hydroxide? A: a plumber B: a gardener C: a bricklayer D: a mechanic

A roller coaster is entering a vertical loop which has a radius of 25.0 m. If the coaster is traveling at 45.0 m/s as it enters the loop, how much is the centripetal force that you experience? (Assume your mass to be 75.

Which best describes tropical continental climate during the summer? A. clear, dry weather, B. cloudy, wet weather, C. cold, dry weather, D. hot, dry weather