Physicsacademic

In 1-2 sentences, give an example of how mechanical energy can be changed into sound energy.

The specific weight of water is 9810 N/m3. A block of composite has a volume of 1.8 m3 and has a mass of 1,539 kg. What is the specific gravity of the composite? Provide your answer with two decimals.

"Which formula represents Snell’s law? A. n1 sin θ1 = n2 sinθ2"

"What term describes electromotive force? A. Power B. Voltage C. Resistance D. Current"

For a drag force of the form F=−bv, what are the units of b?

The atmospheric pressure on a mountain is 550 mmHg and 1 atm is equal to 760 mmHg. What is the pressure in atm? Give your answer to 2 significant figures.

"If you add 1.33 MJ of heat to 500 g of water at 50°C in a sealed container, what is the final temperature of the steam? The latent heat of vaporization of water is 22.6×10 5 J/kg. The specific heat of steam is 2010 J/kg K. The specific heat of water is 4186 J/kg K. A) 195°C B) 123°C C) 112°C D) 100°C E) 147°C"

"At sea level, ISA atmospheric pressure is: A. 14.7 kPa B. 10 Bar C. 14.7 PSI"

An 80.0 kg man is standing on a frictionless ice surface when he throws a 2.00 kg book at 10.0 m/s. With what velocity does the man move across the ice?

If the density of water is 0.0361 lb/in3, and the column of water is 27.7”. a) what is the pressure in psi? b) If the fluid is mercury would the pressure increase or decrease? Explain your answer.

Describe the difference between series and parallel circuits. Elaborate on your reasoning and justify your response. A. Series circuits have components connected in a single pathway, while parallel circuits have components connected in multiple pathways. B. Series circuits provide independent paths for current flow, while parallel circuits have a common path for current. C. In series circuits, the voltage across each component is the same, while in parallel circuits, the current through each component is the same. D. Series circuits provide more resistance than parallel circuits, affecting the overall current flow.

How many hp (horsepower) are produced by a 3000-watt engine?

Provide examples and non-examples of an electron.

"What does the ideal gas law describe? A. The relationship between the temperature, volume, and kinetic energy of a gas B. The relationship between the pressure, volume, temperature, and amount of a gas C. The relationship between the temperature, pressure, and molar mass of a gas D. The relationship between the pressure, molar mass, and molality of a gas"

What are the units of mass and weight in the English system? Explain.

What do the number of peaks in a PES spectrum reveal about the energy sublevels occupied by electrons in an atom?

Average velocity equals distance traveled divided by time.

"Which of the following best describes the difference between mass and weight? A. Mass includes acceleration due to gravity. B. Mass and weight are the same things. C. Weight includes acceleration due to gravity. D. Mass and weight are the same but have different units."

"Which color of visible light has the shortest wavelength? A. green B. red C. violet D. yellow"

"Which of the following describes the energy transformations that occur when a toaster is used to make toast? A. Thermal energy is transformed into chemical energy in the toaster, and chemical energy is transformed into thermal energy in the toast. B. Electrical energy is transformed into thermal energy in the toaster, and chemical energy is transformed into thermal energy in the toast. C. Light energy is transformed into thermal energy in the toaster, and thermal energy is transformed into chemical energy in the toast. D. Electrical energy is transformed into thermal energy in the toaster, and thermal energy is transformed into chemical energy in the toast."

What happens when an unstoppable force meets an immovable object?

The 4-second urgent time and distance generally correspond to: a) Stopping distance under ideal conditions b) Reaction time when distracted c) Safe following distance at high speeds d) Braking time on wet surfaces

The density of glycerin is 1.26 grams/cm³. How many pounds/ft³ is this? Use the conversion rates of 454 grams/pound and 28,317 cm³/ft³. Express your answer to the correct number of significant figures. The density is ___ pounds/ft³.

Calculate the volume and density for each sample and the average density of the six samples.

If a man weighs 155 lb on Earth, specify: (a) His mass in slugs (b) His mass in kilograms (c) His weight in newtons If the man is on the moon, where the acceleration due to gravity is different, determine: (d) His weight in pounds (e) His mass in kilograms

A person drops a cylindrical steel bar (Y = 1.70 x 1011 Pa) from a height of 1.30 m (distance between the floor and the bottom of the vertically oriented bar). The bar, or length L = 0.63 m, radius R =0.55 cm, and mass m=1.30 kg, hits the floow and bounces up, maintaining its vertical orientation. Assuming the collision is elastic (bounces) and no rotation occurs, what is the maximum compression of the bar?

What is the formula for Newton's Third Law of Motion?

How is volume calculated given mass and density? A. Sum of mass and density B. Mass divided by density C. Mass multiplied by density D. Difference of mass and density

Why is the Atwood machine useful in the determination of the acceleration of gravity?

The law of conservation of energy states that energy cannot be created or _______. However, energy can be _________ from one substance to another. The first blank is 'destroyed' and the second blank is 'transferred'.

Which of the following are quantized values? A. The elevation of the flat parts of a staircase B. The floors of a skyscraper C. The speed of an automobile Which of the following statements is false? Select an answer and submit.

One pound is equivalent to 4.45 newtons. What is the weight in pounds of 1 newton?

How do you convert a wavelength of 500 nanometers into energy in joules?

The highest point of a wave is called the: a. height. b. trough. c. crest. d. wavelength.

What is the value of Mu Naught?

What do the different colors in a line spectrum represent? Why are the spectra for each element unique?

Why is density an intensive property?

According to the physical law of centrifugal force, the application of brakes within a turn will _______ steering capability.

What makes stopping quickly in a curve more difficult?

Which of the following is an example of cohesion? A. water transforming into vapor B. water soaking into a paper towel C. water slowly dissolving rocks over time D. water forming droplets during a rainstorm