PHYSICS HIGH SCHOOL

You pull a sled with a package on it across a snow-covered flat lawn. If youapply a force of 65.1 N to the sled, it accelerates at 1.24 m/s2. What is the
combined mass of the package and the sled? (Assume there is no friction.)
You pull a sled with a package on it across - 1

Answers

Answer 1
Answer:

You pull a sled with a package on it across a snow-covered flat lawn. If you apply a force of 65.1 N to the sled, it accelerates at 1.24 m/s2. The combined mass of the package and the sled m = 52.50 kg

The given data to find Mass,

The force applied to the sled, F = 65.1 N

Acceleration of the sled, a = 1.24 m/s²

What is force?

Forces are defined by both strength and direction.

Force is a vector quantity. It is a quantity that is described by Magnitude and Direction. The strength of a force is its magnitude and the direction, well it is the direction the magnitude is applied on the object.

We need to find the combined mass of the package and the sled. Let it is m. Using definition of force as follows :

F = ma

m = F/a

m = 65.1 /1.24

Mass, m = 52.5 Kg.

If you apply a force of 65.1 N to the sled, it accelerates at 1.24 m/s2. The combined mass of the package and the sled m = 52.50 kg

Hence, Option C is the correct answer.

Learn more about Force,

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Answer 2
Answer:

Answer:52.5

Explanation:

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Which of the following is a possible use for nuclear energy?a. power plants
b. weapons
c. powering submarines
d. all of the above

Answers

Nuclear energy can be used to power all ofthe above choices. Nuclear power plants produce radioactive waste that must bestored properly. It is very impossible for a nuclear power plant to have nowaste at all since lots of chemicals are used to create the process as it givesenergy to other machines, weapons such as bombs and  powering submarines.  Radioactive waste can not be released intolocal water supplies since the wastes are very radioactive and may causemutation to the fishes and bioaccumulation which will affect humans as well. Itwill also cause air pollution if the chemicals are not stored properly.

Answer:

D. All of the above. you're welcome

A(n) is a material that causes a wave to bounce off of it

Answers

Answer;

A barrier, a surface or a boundary

Explanation;

Reflection is the property waves that occurs due to the bouncing back of a wave after it strikes a barrier.

Reflection involves change in direction of a wavefront at an interface between two different media such that the wavefront returns into the medium from which it originated. In other words, the direction of the wave changes when they bounce of a barrier or a surface.

Its a Reflector

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A skier starting from rest accelerates in a straight line down a 43,000 m slope at 1 m/s. How fast were they moving after 5 s?

Answers

Answer:

5m/s

Explanation:

The skier accelerates at 1 m/s, then, the acceleration is:

a=1(m)/(s^2)

to find the speed after 5 seconds you use the following formula:

a=(v-v_o)/(t)

but vo = 0m/s because the skier is at rest at the beginning.

You do v the subject of the formula:

v=at=(1(m)/(s^2))(5s)=5(m)/(s)

hence, the velocity is 5m/s

Calcium hydroxide + hydrochloric acid mc012-1.jpg calcium chloride + waterWhich is the corresponding formula equation?

Answers

Ca (OH)_2 + 2HCl \rightarrow Ca Cl_2 + 2H_2 O

Explanation:

First of all, let's try to identify the different substances involved in the reaction:

- calcium hydroxide: calcium is the element Ca, while hydroxide corresponds to the ion OH^-. Calcium has 2 valence electrons, so the calcium ion is Ca^(2+), and since the ion OH^- has only one negative charge, we need two of them to combine with the calcium ion, therefore: Ca(OH)_2

- hydrochloric acid: this is an acid, so with one ion of hydrogen H^+, and the other element is the chlorine, which in the ion form is Cl^-, so the hydrochloric acid is HCl

- calcium chloride: this is the combination of the calcium ion, Ca^(2+), with the chlorine ion, Cl^-, so the compound is CaCl_2

- Water: this is given by H_2 O

so, the reaction is

Ca (OH)_2 + HCl \rightarrow Ca Cl_2 + H_2 O

However, this reaction is not balanced yet: in fact, we have 2 atoms of oxygen on the left and only one on the right. Moreover, we have 3 atoms of hydrogen on the left and only 2 on the right. Therefore, in order to balance it, we must write:

Ca (OH)_2 + 2HCl \rightarrow Ca Cl_2 + 2H_2 O

D) Ca(OH)2(s) + 2HCI(l) -> CaCl2(aq) + 2H2O(l)

A change that occurs when a solid melts or a liquid freezes is an example of a phase change.a. True
b. False

Answers

Condensation is the change ofthe substance from liquid to solid phase. Example of this is the formation ofice. Vaporization is the change of substance from liquid to gas phase. Exampleof this is the boiling of water. Deposition is the change of a substance fromgas to solid phase. Example of this is the formation of ice on a winter day.Sublimation is the change of a substance from solid to gas phase. Example ofthis is dry ice. These are all examples of a phase change. The answer is letter A.

Answer:

True

Explanation:

What happens to parallel light rays that strike a concave lens?

Answers

When parallel light rays comes across a concave lens, the rays are refracted outwards. Concave lenses are thinner in the middle part. Parallel light rays diverge and seems to appear from one point called the principal focus. The image formed is smaller. 

Answer:

The light ray that pass through the lens diverge and is refracted outwards and never meets at a focal point.

Explanation:

Divergent lenses (also called concave lenses) are transparent bodies bounded by two refractory surfaces with one central axis in common. When a parallel light ray strikes a lens, it is refracted by changing its direction, this refraction in the divergent lens causes the rays to move away from the central axis, ie the ray of light passing through the lens diverges and is refracted outward. and is never at a focal point.
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