PHYSICS HIGH SCHOOL

The main difference between the internal combustion engine and the diesel engine is that the diesel engineA. has no connecting rods.
B. does not have a crankshaft.
C. has no ignition system.
D. does not utilize pistons.

Answers

Answer 1
Answer: The correct answer is (b.) does not have crankshaft. The main difference between the internal combustion engine and the diesel engine is that the diesel engine does not have a crankshaft. The crankshaft is for the conversion of the reciprocal into a circular motion.

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A 20-kg bicycle carrying a 50-kg girl is traveling at a speed of 8 m/s. What is the kinetic energy of the girl and bicycle?

Answers

E= (mv^(2))/(2)= ((20+50)*8)/(2) = (560)/(2) =280 J

A 3.8 kg object to is lifted 12 meters. approximately how much work is performed during lifing? A) 45.6 J B)588 J C) 466.9J D) 372.4 J

Answers

You would do mass x distance which is 3.8 kg x 12m which equals A. 45.6 J.

If frequency is kept constant, how are the velocity and wavelength of a wave related?

Answers

Answer;

Velocity and wavelength are directly proportional when frequency is kept constant.

Explanation;

  • Frequency of a wave is the number of complete oscillations made by a given wave in one second.
  • Wavelength on the other hand, is the distance between two successful crests or troughs in a transverse wave or two successful rarefactions or compressions in a longitudinal waves.
  • The speed of a wave is given by the product of the frequency of a wave and the wavelength.
  • Speed = Frequency × wavelength,
  • Therefore, if frequency is kept constant, then the speed of a wave is directly proportional to the wavelength, such that an increase in wavelength increases the speed of the wave and vice versa.

What is a time paradox?

Answers

Hey There Wolfie,

What is a time paradox?

A temporal paradox, time paradox, or time travel paradox is aparadox, an apparent contradiction, or a logical contradiction that is associated with the idea of time and time travel. Temporal paradoxesfall into two broad groups: consistency paradoxes exemplified by the grandfather paradox; and causal loops

Which of these charges has the greatest magnitude?a charge of -5
a charge of -2
a charge of +4
O a charge of +1

Answers

Answer:

a charge of +4

that's how I could understand

Observations show that interstellar clouds can have almost any shape and, if they are rotating at all, their rotation is not perceptible. however, as shown in the video, the nebular theory predicts that a cloud will rotate rapidly once it shrinks to a small size. what physical law explains why a cloud will rotate rapidly as it collapses?

Answers

The law of conservation of angular momentum holds because the cloud is collapsing only due to gravity.Because angular momentum is proportional to velocity times radius, keeping this product constant requires that the velocity of rotation increase when the cloud radius decreases. Hope it helps. 
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