PHYSICS HIGH SCHOOL

if a train travelling at 10m/s starts to accelerate at 1m/s^2 for 15s on a straight track, calculate its final speed in m/s

Answers

Answer 1
Answer:

Answer:

-5 m/s

Explanation:

vo = 10 m/s

a = -1 m/s²

t = 15 s

v = vo + at

= 10 + (-1)(15)

= -5 m/s

(actually the train has come to a stop at t = 10s)

Related Questions

An ideal gas is enclosed in a piston-cylinder apparatus with the piston being freely movable. Given that LaTeX: \DeltaΔE is positive and LaTeX: \DeltaΔH is negative following a process, ____ the system absorbs heat and expands during the process. the system absorbs heat and contracts during the process. the system loses heat and expands during the process. the system loses heat and contracts during the process. the system loses heat but neither expands nor contracts during the process.
How does the scientific process generally begin?
Which of the following accurately describes the differences between the SI and English systems of measurement? A. The two systems are used interchangeably in the scientific and technical communities. B. The English system is more commonly used in Europe than in the United States. C. The English system is preferred for use in the scientific and technical communities due to its ease of use over the SI system. D. The SI system, which is based on the metric system, has been more widely adopted than the English system, which is harder to use.
How far will a you travel if you run for 10 minutes at 2 m/sec?
There is little vertical air movement in the __ because of the cold, heavy air at the bottom of the layer.

During a canoe trip camper paddles distance of 406 M and 70 seconds what is the average speed of the canoe

Answers

Answer:

The average speed is 5.8 m/s

Explanation:

I just did it

Two students standing apart in a classroom have a gravitational force of attraction between them of 3.20 x 10-8 N. If one student has a mass of 50.0 kg and the other has a mass of 60.0 kg

Answers

I have a hunch that you want to know the distance
between the students.    It's just a hunch.

Here's the formula for the force of gravity between 2 masses:

               Force of gravity =  G · m₁ · m₂ / D²

Take the numbers given in the question, write them into the formula,
and solve it for 'D'.

If you just want the answer and don't care to see the work,
then skip to the bottom line now.

To see every step along the way, keep reading:
 

           ' F '                              ' G '                   ' m₁ '      ' m₂ '
    3.2 x 10⁻⁸ nt  =  (6.67 x 10⁻¹¹ nt-m²/kg²) (50 kg) (60 kg) / D²

    3.2 x 10⁻⁸ nt = (6.67 x 10⁻¹¹ x 50 x 60) (nt-m²) / D²

         D²  =  (6.67 x 10⁻¹¹ x 50 x 60) (nt-m²) / (3.2 x 10⁻⁸ nt)

         D²  =  6.253125 m²

         D  =   √6.253125 m²  =  2.5 m      (rounded)

During exercise, the amount of ____________ carried in the blood to the muscles increases.

Answers

The correct answer is: Oxygen

Explanation:
In order to function properly (movement etc.) during exercise, muscles require oxygen. During exercise, the depth as well as the rate of breathing increase, which in turn increases the amount of oxygen inhaled. In order to expand and contract lungs and for other bodily movements, muscles require oxygen, and for that, more oxygen is carried in the blood to muscles. Hence, the correct answer is Oxygen.

Your answer would be oxygen because when doing moderate to vigorous workouts, your body needs more oxygen to be supplied to your muscles.

If a 78.2 kg kangaroo weighs 6742 N on the planet katar, calculate katar's radius

Answers

Answer:

  about 7500 km

Explanation:

The mass of planet Katar is 7.27×10^25 kg. The force on the kangaroo is given by ...

  F = GmM/r^2

Solving for r, we have ...

  r = √(GmM/F) = √(6.67×10^-11 × 78.2 × 7.27×10^25 / 6742) ≈ √(5.62×10^13)

This is in meters, so the radius in km is about ...

  r ≈ 7500 km

Which of the following is a major ocean on Earth? A. Mediterranean
B. Gulf of Mexico
C. Bering Sea
D. Indian

Answers

The Indian Ocean. 
The rest of your options are not oceans, they are bodies of water. (e.g: lakes,rivers,gulfs) 
The answer is d, the Indian Ocean

The resultant resistance of two resistance wires in series combination is 108 ohm and in parallel combination is 24 ohm. find the value of individual resistance.

Answers

Call the two resistors 'x' and 'y'.

In series, the resultant resistance is their sum: x + y = 108
Notice that y = 108 - x.  I think we'll use that very soon.

In parallel, the resultant resistance is (their product) / (their sum) = xy/108 = 24

Multiply each side by 108:

xy = 2,592

Substitute for 'y' :

x(108 - x) = 2,592

108x - x² = 2,592

-x² + 108x - 2,592 = 0

x² - 108x + 2,592 = 0

Use the quadratic formula to find:

x = 72 . . . then y = 108 - 72 = 36
or
x = 36 . . . then y = 108 - 36 = 72

The individual resistors are 36Ω  and  72Ω .


Other Questions
Choose heated air or cooled air for the following atmospheric property term: risesheated air cooled air
The Sun and most stars are made almost entirely of a. hydrogen and carbon. b. helium and nitrogen. c. oxygen and nitrogen. d. helium and hydrogen.
Two students are studying for a Science Test. On the table, they had a glass of water and identical cell phones. Both of their phones had run out of battery, therefore they were both charging in the same wall outlet. One student’s charging cord was 3ft and the other student’s charging cord was 9ft. which of the phones charged the fastest using Ohm’s Law. Cite evidence to support your theory.
A bicyclist bikes the 56 mi to a city averaging a certain speed. The return trip is made at a speed that is 6 mph slower. Total time for the round trip is 11 hr. Find the​ bicyclist's average speed on each part of the trip.