2. The outward evidence for this transformation can be seen only in the mechanical motion of the motor.
True or False
3. What is true of the efficiency of this motor?
a. it is more than 100% efficient
b. it is 100% efficient
c. it is less than 100% efficient
d. none of the above
Answer:
1. True
2. False
3. c. it is less than 100% efficient
Answer: B)
A hollow double concave lens acts as a diverging lens. When it is filled with a medium of higher refractive index than the surrounding, its diverging power increases.
So if the lens is:
A) Filled with air (n=1) and immersed in water (n=1.33) - Incorrect, air has lower refractive index than water
B) Filled with water (n=1.33) and immersed in CS2 (n=1.6) - Correct, water has lower refractive index than CS2
C) Filled with air (n=1) and immersed in CS2 (n=1.6) - Incorrect, air has lower refractive index than CS2
D) Filled with CS2 (n=1.6) and immersed in water (n=1.33) - Incorrect, CS2 has higher refractive index than water
Therefore, the lens will act as a diverging lens when filled with water and immersed in CS2, which is option B.
The key is that the material inside the lens must have a lower refractive index than the surrounding medium to increase the diverging power of the concave lens.
Explanation:
A bumper car with a mass of 200 kilograms traveling at a velocity of 3.5 meters/second collides with a stationary bumper car with a mass of 250 kilograms. the kinetic energy of the system after the collision is 1190,25 J.
The energy is the ability to work or produce action or movement and it manifests itself in many different ways mostly body movement, heat, electricity, etc.
The different types of energy are Kinetic energy is associated with the movement of bodies. Potential energy which is stored form of energy by virtue of a body's position relative to its surface is also called gravitational potential energy.
Thermal Energy associated with the kinetic energy of the molecules that make up an element, Chemical energy released from chemical reactions, Solar energy released from sunlight.
Ek = (m·V²)/2
V - velocity of system after the collision
m = m1 + m2
Ek = (m1 + m2)·V²/2
Ek = (200 +250)·2,3²/2 = 450·5,29/2 = 1190,25 J
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The amount of joules of energy used by the iron is 2.16 × J.
Energy refers to the capacity to do work. The formula for electrical energy is as follows:
Energy = Power x Time
Where:
According to this question, Nicholas spends 20 minutes ironing shirts with his 1,800-watt iron. The energy used by the iron can be calculated as follows:
Energy = 1800watts × 1200s = 2.16 × J
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Answer:
The correct answer is option B, Mental Health
Explanation:
Mental health is referred to as mental illness when a person is bounded by prolonged negative thoughts. The ongoing signs and symptoms of a poor mental health can cause frequent stress and reduced ability to function. Some common symptoms of mental illness include
• Excessive anger, hostility or violence
• Extreme mood changes
• Confused thinking or reduced ability to concentrate
• Excessive fears or worries