Physical science

Which involves the larger number of calories

The condensation 01G of staying at 100°C to 100°C water

Which pole of a compass needle points to a south pole of a magnet?

north pole

Ar jack system will increase the potential energy of a heavy load by no More than 1000 J with a work input of 2000 Jay. The eaves fission C of the Jack system is no more than

50%

The voltage across the input terminals of a transformer is 110 V. The primary has 50 loops and secondary has 25 loops. The voltage transformer puts out is

55v

The period of a second hand on a clock is

60 seconds

There are five common rock-forming mineral groups - the silicates, carbonates, oxides, sulfides, and sulfates. Of these five groups, which two form economically important ores?

Oxides and sulfides

tangential velocity is velocity

Parallel to the surface of the Earth

Each night you measure your height just before going to bed. When you arise each morning, you measure your height again and consistently find that you are 1 inch taller than you were last night but only as tall as you were 24 hours ago! Is what happens to your body in this instance best described as a physical change or a chemical change?

Physical change because it readily reverses

Would you use a physical model or a conceptual model to describe the following: the brain; the mind; the solar system; the beginning of the universe?

Physical; conceptual; physical; conceptual

The force of gravity acts on all apples on Apple tree. Some apples are twice as far from the ground as others. The twice as for apples, for the same mass, have

Practically the same weight

Suppose at the surface of the earth a person can do 20 push-ups. In a spaceship far away from any gravitational influence, exhilarating at G, the same person could do

20 push-ups

Temperature in the air is increased by the process of

Moisture condensation

Compared to the density of a kilogram of feathers, the density of a kilogram of the lead is

More

In a solution of 77% nitrogen and 23% oxygen, which is the solvent

Nitrogen

A common 5-L metal can will float in air if it is

Nonsense! Unless the can and displaced air weigh the same, the can can't float in air

Totality during a solar eclipse is not totally dark because

Of the light from the solar corona

Re-fraction of sound can occur in

Water and air

The pupil of your eye is a net

absorber of radiant energy

When a car is braked to a stop, its kinetic energy is transformed to

heat

Regions in which earthquakes are common are also regions in which

volcanoes are common

At lower elevations the air is generally

warm and heavy

Consider a piece I have a metal that is 5°C. If it is heated until it has twice the thermal energy, it's temperature will be

283°C

When a 10- V Battery is connected to a resistor, 2A of current flow in the resister. What is the resistors value

5 ohms

According to most estimates, earth is approximately

1.5 billion years old

According to the following balanced Chemical equation, if you want to generate two molecules of H2O, how many molecules of O2 do you need? 2H2 + O2 —> 2H2O

4

If you wish to spear are you read this with a red laser beam, you should compensate for refraction between the air and water by aiming your laser

Above the sighted fish

If you remove two neutrons and two electrons from a silver atom (Ag), what new element is formed?

Ag+2

Is chemistry study of the submicroscopic, The microscopic, macroscopic, or all three?

All three because most everything is made up of atoms and molecules

A composite volcano is formed by

Alternating layers of lava, Ash and mud flow debris

Quasars are

Ancient, extremely high energy galaxies believed to have formed in the early universe

Color depends on what characteristic of light?

Both It's frequency and wavelength

Which of the following bonds would be the least polar?

C-H

To say that electric charge is conserved is to say that electric charge

Can neither be created nor destroyed

A bullet is fired straight down from the top of a high cliff. Neglecting your resistance, the acceleration of the bullet in meters per second is

G

The early Paleozoic Is often referred to as the "Cambrian explosion" because of the

Great diversity of life that blossomed and during that time

Compared to a giant iceberg, a hot cup of coffee has

Higher temperature but less thermal energy

The air that a scuba diver breathes is pressurized to counteract the pressure exerted by surrounding water. Under these conditions, excess amounts of nitrogen dissolves in bodily fluid's, such as blood. If the diver ascends to the surface too rapidly, that excessive nitrogen bubbles out of the bottle he fluids- much like carbon dioxide bubbles out of a soda immediately after it has been opened. This results in a painfully and potentially lethal medical condition known as the bends. Why does a breathing a mixture of helium and oxygen rather than air help divers to avoid getting the bends?

The helium is less soluble in the bodily fluids and so less dissolves for a given pressure. Upon decompression, there is less helium to "bubble out" and cause potential harm.

Hey anticline is a fold in which the

The limbs bend downword

An object weighs 20 N on earth. A second object weighs 30 N on the moon. Which has greater mass?

The one on the moon

What happens to the pH of 1M solution of hydrochloric acid, HCI, as carbon dioxide gas is bubbled into it?

The pH remains unchanged. Carbon dioxide is unable to affect the pH in the presence of such a concentrated solution of such a strong acid.

The attraction of a persons body towards the earth is called a weight. The reaction of this force is

The person's body pulling on the Earth

Compared with the mass of a certain object on earth, the mass of the same object on the moon is

The same

A glacier forms when

snow accumulates to form ice and the ice mass begins to flow under its own weight.