PHYSICS HIGH SCHOOL

A car drives for 3 hours at 40 mph, and then drives 300 miles at 60 mph. what is the car's average speed, in mph?

Answers

Answer 1

Answer:

Answer:

52.5 mph

Explanation:

part 1,

speed=40mph

distance= 40×3=120 miles

time= 3 hours

part 2

speed= 60mph

distance= 300 miles

time= 300÷60= 5hours

Average speed= (300+120)÷(5+3) = 52.5mph

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A 1.7-kg block of wood rests on a rough surface. A 0.011-kg bullet strikes the block with a speed of 670 m/s and embeds itself. The bullet-block system slides forward 2.4 m before coming to rest.

Answers

What is the coefficient of kinetic friction between the block and the surface? Express your answer using two significant figures.

Answer:

0.39

Explanation:

Given information

m1=1.7 Kg

m2=0.011 Kg

v2=670 m/s

d=2.4 m

m2v2=(m1+m2)v hence $v=\frac {m2v2}{m1+m2}$ and also $a=\frac {v^(2)}{2d}$

The deceleration due to friction is given by

$F=\mu_k N=\mu_k W=\mu_k (m1+m2)g$

$F=(m1+m2)a=\mu_k (m1+m2)g$ therefore $a=\mu_k g$

Therefore, $a=\frac {v^(2)}{2d}=\mu_k g$

$\mu_k=\frac {1}{2dg}(\frac {m2v}{m1+m2})^(2)=\frac {1}{2*2.4*9.81}* (\frac {0.011*670}{1.7+0.011})^(2)$

$\mu_k=0.39$

The density of ocean water increases when ita. joins the Gulf Stream.
c. gets warmer.
b. gets colder.
d. turns to ice. Please select the best answer from the choices provided A B C D

Answers

The correct answer is (b.) gets colder. The density of the ocean water increases when the water gets colder. Therefore, it is already concluded that the density of the water and its temperature is indirectly proportional since as the density increases, the temperature decreases.

Answer: Option (b) is the correct answer.

Explanation:

Density means the degree of compactness, that is, when particles of an object or substance are closer to each other then it is said that density of object is high.

Therefore, when ocean water gets colder then particles of water will gain potential energy and thus they will come closer to each other. Hence, there will be increase in density of ocean water when it gets colder.

When the core of a star like the sun uses up its supply of hydrogen for fusion, the core begins to ________?

Answers

Answer: shrink and heat

Stars similar to our Sun use hydrogen as fuel, creating helium in the process of nuclear fusion.

Now when the hydrogen is used up, the core of the star reaches such a temperature that begins to transform the helium into carbon. That is, the core heats up more due to the continuous fusion reactions and shrinks because it will not have enough pressure to maintain its size.

How do summer conditions affect weathering

Answers

weathering is a chemical and a physical process in the summer it is ussually hot and in the winter it is usually cold in the spring is a mild temperature during the day warm+cold=mild and at night time during the spring its a little chilli but for some reason in the desert during the day it is really hot and at night in the desert it is really cold.

I hope I helped you

What kinds of bonds can happen between the elements of a compound

Answers

What kinds of bonds can happen between the elements of a compound?

Covalent and Ionic

Your car is traveling at 70/mi/h (1000ft/s) your sneeze and your eyes close for 0.33 seconds how far did you travel during your sneeze?

Answers

If you're moving at 70 mi/hr, then you cover 33.88 feet in 0.33 sec. If you're moving at 1,000 ft/sec, then you cover 33 feet in 0.33 sec. 70 mph and 1,000 fps are not equivalent. 1,000 fps is about 682 mph, whereas 70 mph is about 103 fps.

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