What causes colour in fireworks

To pull a 50 kg crate across a horizontal frictionless floor, a worker applies a force of 210 N, directed 20° above the horizontal. As the crate moves 3.

A good way to decrease the strength of a magnet is to what?

The apparent backward movement of a planet is called A. eccentricity. B. heliocentric motion. C. Kepler's first law of motion. D. retrograde motion.

Starting from rest, a car accelerates at a rate of 4.2 m/s2 for a time of 5 seconds, What is its velocity at the end of this time?

Justin Bieber is thrown horizontally at 10.0 m/s from the top of a cliff 122.5 m high. How long does it take to reach the ground? What is the horizontal displacement? What is Justin's final velocity?

Kaylie is describing the physical properties of an orange and a lemon. which two physical properties can she determine without using any measurement instruments

What is an example of a third class lever and why use it? A) pulley; changes direction B) baseball bat; increases velocity Eliminate C) car jack; increases the weight it can lift D) wheel barrow; makes it easier to move a load

1. The horizontal and vertical components of a projectile's velocity are a. directly proportional C. independent of each other b. inversely proportional d. equal

Which features involve compression? Select the three correct answers. A. Reverse faults B. Anticlines C. Folded mountains D. Normal faults E. Monoclines

You place a cup of 210 degrees F coffee on a table in a room that is 68 degrees F, and 10 minutes later, it is 200 degrees F. Approximately how long will it be before the coffee is 180 degrees F? Use Newton's law of cooling: