PHYSICS HIGH SCHOOL

a constant force of 391 n acts on a spacecraft of mass 7870 kg that has an initial velocity of 38 m/s. how far has the spacecraft traveled when it reaches a velocity of 4820 m/s?

Answers

Answer 1

Answer:

Answer:

The distance travelled is 2.34*10^8 m.

Explanation:

The acceleration of the spacecraft is,

a=F/m

=391/7870 = 0.04968 m/s^2

The distance travelled,

d=v^2-v0^2/2a

=(4820)^2-(38)^2 / 2(0.04968)

=2.34*10^8 m.

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Which of the following is the best name for a compound made from calcium and bromine? (CaBr2) calcium bromide calcium dibromide monocalcium dibromide calcium bromine II

Answers

By definition, we have to:

Calcium Bromide is an inorganic salt formed by granular white crystals that responds to the formula CaBr2.

Calcium bromide has no odor, is colorless and has a bitter taste.

It is obtained by adding Hydrobromic Acid to Calcium Oxide, Calcium Carbonate or Calcium Hydroxide.

The substance that results is then subjected to a crystallization process, which involves evaporating the water.

From here, you get then:

CaBr2.

Answer:

CaBr2 = Calcium bromide.

Answer:The name of the compound made from calcium and bromine $CaBr_2$ is calcium bromide.

Explanation:

The nomenclature of ionic compounds is given by:

1. Positive is written first.

2. The negative ion is written next and a suffix is added at the end of the negative ion. The suffix written is '-ide'.

Hence, the name of $CaBr_2$ is calcium bromide.

Can the normal force on an object be directed horizontally?

Answers

For this case, the first thing you should do is take into account the definition of normal force.

By definition, we have:

The normal force is that which is exerted on an object that is perpendicular to the surface.

If we define the coordinate system as:

Horizontal axis points to the right
Vertical axis points up

Then An object resting on a wall can have normal force in a horizontal direction.

Answer:

The normal force is perpendicular to the surface. The direction can be horizontal. Example: an object on a wall.

A stealth bomber is flying straight and level at a constant speed of 150 m/s at an altitude of 3500 m above the ground. It drops a bomb intended to hit a specific target on the ground. a) How long will it take for the bomb to hit the ground?

b) At what horizontal distance away from its target must the bomber release the bomb in order to strike its target?

**disregard air resistance**

Answers

$Height = (1)/(2) gt^2 \n \n 3500 = (1)/(2) (9.8)(t^2)\n \n3500 = 4.9t^2\n\nt^2 =714.285714286\n\n\boxed {t=26.73~seconds}$

$\sf Horizontal ~distance = velocity * time\n\n Horizontal distance =150 * 26.73 \n\nHorizontal ~distance =4009.5$

_______ is the idea that people should be more interested in advancing their lives on earth than in worrying about getting to heaven

Answers

The correct answer for the question that is presented is this one: "Theology." Theology is the idea that people should be more interested in advancing their lives on earth than in worrying about getting to heaven. Studying Theology requires a lot of faith from the learner.

how much time would it take for an airplane to reach its destination if it traveled at an average speed of 790 kilometers/hours for a distance of 4700 kilometers? what is the airplanes speed in miles/hours?

Answers

If the airplane covered 790 kilometers along the ground every hour,
and if it could keep that up, and if there was no wind, and if the
airplane pointed its nose directly toward its destination and never
zigged or zagged even the slightest bit, then it would cover
790 kilometers of the distance during the first hour, another
790 kilometers of the distance during the second hour, another
790 kilometers of the distance during the third hour, 790 more
kilometers of the distance during the fourth hour, and so forth
and so on until it had arrived at its destination.

The minimum time it would need for the total trip would be

   (4,700 kilometers) / (790 kilometers per hour) =

   5.9494... hours (rounded)

   5hours 56m 57.7seconds (rounded) .

(790 kilometers) x (1 mile / 1.609344 kilometers) = 490.88 miles (rounded)

$t = ( \Delta S)/( \Delta V) \n \n t = (4700)/(790) \n \n t \approx 5.95 hours.$

1 kmph is approx. 0.6214 mph.
Then.. 790 will be approx. 490 mph.

How did some U.S. citizens oppose the Vietnam war?Many left the U.S. for Europe.
Many expressed opposition through protest marches.
Many sent supplies to the South Vietnamese.

Answers

They protested by marching in the streets.

Answer:

Many expressed opposition through protest marches.

is the answerd.

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