Until the late 1800s, which of the following sources was used to heat most homes?

Ashanti is 18 months old. When her mom leaves her at the babysitter's house, Ashanti cries initially. After a few moments, she stops crying because her mom is "out of sight and out of mind.

Latent heat of vaporization refers to which changes of state?

An object is lifted to a certain height and then dropped. During the drop, which of the following is increased? a) gravitational potential energy b) kinetic energy c) total mechanical energy d) B and C

A hiker walks with an average speed of 1.2 m/s. what distance in kilometers does the hiker travel in a time of 1 hour

A structural engineer is using this table to design a wall to protect a city near the ocean. How high should the engineer build the wall?

Which of the following is an example of applied research?

A Cadillac Escalade has a mass of 2,569.6 kg, if it accelerates at 4.65 m/s^2 what is the net force on the car?

If you are trying to balance a seesaw and you have a higher mass on the left, should the mass on the right be placed at a greater distance or lower distance to balance it? Why?

A car travels 300 km in the first 3 hours of a trip. Then it hits traffic and travels only 60 km during the last hour. What is the average speed of the car? a.) 180 km/h b.) 100 km/h c.) 90 km/h d.) 120 km/h

What is the purpose of using a wedge? A. separates objects B. keeps objects together C. allows you to exert force over a distance