If you had two forces, one with a magnitude of 25 N and the the other with a magnitude of 100 N, what would be the maximum net force these forces could exert on an object?

Answers

Answer 1

Answer:
The maximum occurs when both of those forces push on an object
in the same direction. Then, the net force on the object is 125 N.

Answer 2

Answer: One of the things he was bothered by was the long-held belief of Aristotle thatobjects, including the Earth, naturally come to rest unlessthey are forced to move byan external force(the motion of the other planets was considered special– they had theproperty ofquintessenceso that their natural state was to move in circles). One thingthat bothered Copernicus is that nobody could imagine a force large enough to keep theEarth moving around the Sun. Galileo and Newton understood that objects had inertia–that they tended to keep moving in a straight line at constantspeed (or sit still) unlessacted on by an external force– in the cases of objects ‘naturally’ coming to rest, frictionwas identified as the responsible force. So for the Earth, there doesn’t need to be anexternal force to keep it moving, just so long as it isn’t being affected by friction. As wewill learn in subsequent chapters, gravity is what keeps theEarth moving in an ellipsearound the Sun rather than just moving through space in a straight line.

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An observation of the red shift of galaxies suggests that the universe isa. expanding. c. reversing. b. contracting. d. stagnant.

Which of the following is NOT a model of the solar system?a. Sun-centered
c. Modern view
b. Earth-centered
d. all of the above are solar system models

Answers

Correct answer choice:

B. Earth-centered

Explanation:

Heliocentric theory is the planetary model in which the Earth and planets rotate around the Sun at the focus of the Solar System. Historically, Heliocentric theory was objected to geocentric theory, which set the Earth at the core. This approach was explained in sections by several cosmologists over various times, particularly Aristarchus, Copernicus, Kepler, and Galileo.

Answer:

The correct answer is option b, Earth centered

Explanation:

For the very first it was proposed by Copernicus that it is not the earth but sun which lies at the center of the system and rest all planets revolve around the sun. This sun centered model is known as heliocentric system and is also referred to as the modern view. This model was also helpful in solving two major queries instantly –

a) Varying brightness of planets

b) Retrograde motion.

Air is a good conductor of heat. Please select the best answer from the choices provideda. True
b. False

Answers

the answer would be true because air can be heated easily

The density of seawater is 1.025 g/ml. what is the mass of 1000 liters of seawater in g amd kg?

Answers

You are giventhe density of seawater which is 1.025 grams per milliliters and its volume at1000 liters. You are required to find the mass of the seawater in grams andkilograms. You need to know that density is equal to mass over volume. Let usdenote D as our density, V our volume and M as our mass. So,

D = M/V
M = D*V
M = (1.025g/mL)(1000 L)(1000mL/1L)
M =1,025,000 g
To changeinto kilograms, simply divide it by 1000
M = (1,025,000g)(1kg/1000g) = 1,025kg

In which of the following methods of heat transfer is it necessary for the objects to be directly touching one another? A. convection. B. radiation. C. conduction. D. all of these.

Answers

The following method that is necessary for the objects to be directly touching one another is called conduction.

Conduction is the direct transfer of heat

In which of the following sentences is work used in the scientific sense of the word? A scientist works on an experiment in the laboratory.*

B Sam and Rachel pushed, but they could do no work on the car. ????

Answers

B) obviously. Work in a scientific sense is the ability to make a displacement on an object in this case.

In A) the scientist can work on an experiment as your uncle can work on the field planting tomatos.

The diffuser in a jet engine is designed to decrease the kinetic energy of the air entering the engine compressor without any work or heat interactions. Calculate the velocity at the exit of a diffuser when air at 100 kPa and 30°C enters it with a velocity of 357 m/s and the exit state is 200 kPa and 90°C. The specific heat of air at the average temperature of 60°C = 333 K is cp = 1.007 kJ/kg·K.