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dolphi86 [110]
2 years ago
13

Which laboratory activity involves a chemical change?

Physics
2 answers:
Elza [17]2 years ago
6 0
A) leaving a copper penny in vinegar until it turns green
garri49 [273]2 years ago
6 0

Answer:

A on edg

Explanation:

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What type of metals are known as ferromagnetic metals
Sphinxa [80]

Answer:

those who are attracted to magnets. ex: iron, cobalt and nickel

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What is the equivalent resistance of the circuit?
mezya [45]

Answer:

I=VRS=9V90Ω=0.1A

Explanation:

The equivalent resistance is the algebraic sum of the resistances (Equation 10.3. 2): RS=R1+R2+R3+R4+R5=20Ω+20Ω+20Ω+20Ω+10Ω=90Ω. The current through the circuit is the same for each resistor in a series circuit and is equal to the applied voltage divided by the equivalent resistance

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3 years ago
A golf club with 65J of kinetic energy strikes a stationary golf ball with a mass of 46g. The energy transfer is only 20% effici
umka21 [38]
Kinetic energy of golf club = 65J, 
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kinetic energy of ball = [mass * Velocity²]/2,
mass = 46gm = 0.046Kg,
[0.046 * V²]/2 = 13, or 0.046 *V² = 26, 
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V = 23.77 m/sec = initial velocity of golf ball after hitting.
4 0
3 years ago
Why are there only two elements in the first period of the periodic table?(1 point)
Katen [24]

Answer:

because only two electrons can fit in the first orbit around the nucleus, and each period on the table is organized by number of orbits

6 0
2 years ago
The earth’s orbit around the sun is elliptical. What does this word mean?.
omeli [17]

Answer:

An elliptical orbit is the revolving of one object around another in an oval-shaped path called an ellipse. The planets in the solar system orbit the sun in elliptical orbits. Many satellites orbit the Earth in elliptical orbits as does the moon.

3 0
1 year ago
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