PHYSICS HIGH SCHOOL

A horse has an acceleration of 2 m/s2. If it starts from rest, how fast is it going after 1.7 seconds?

Answers

Answer 1
Answer:
       (2  m/s²)  ·  (1.7  s)  =  3.4 m/s
Answer 2
Answer:

1.17m/s2

I believe, you subtract 2-0 on top and 1.7-0 on the bottom and get 2/1.7 which is 1.17

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Which mathematical relationship best describes a graph of gravitational field strength versus distance? (one of the 3 pictures attached or none of the above?)

Answers

The gravitational force between two masses is proportional to

                               (mass-1) x (mass-2) / (the distance between them)-squared

Do you see (distance-squared) in the denominator there ?

That steers you straight to the function [ y proportional to 1/x² ] ... in the middle.
gravitationnal field between two objets = k.m1.m2/d² 
none of the above
the graph is something like that

A car accelerates from 25 km/hr in 30 seconds. what Is the acceleration?

Answers

25 km/hr = 6,9 m/s
acceleration = 6,9 / 30 = 0,23

acceleration = 0,23 m / s²
acceleration is units of distance per time squared, take speed divided by time:

(25 km/hr)/(30 sec) = 0.833 km/hr/sec

these units aren't very helpful, so convert to units more likely to represent what your measuring. probably meters per seconds squared:

(0.833 km/hr/sec)*(1 hr/ 3600sec)*(1000m/km) = 0.23 m/s^2

An ultrasound wave vibrates 30,000 times per second. what is the frequency

Answers


The frequency is 30,000 per second.
That's the same thing as 30 KHz.

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 .


The device which disconnects the start winding in some split-phase motor circuits after a preset speed is obtained is thea. thermostat.
b. commutator.
c. brush spring.
d. relay.

Answers

a. thermostat. is the correct ans

A positive charge is placed in an electric field that points west. What direction is the force on the positive particle?

Answers

A positive charge is placed in an electric field that points west. the direction of the force on the positive particle point toward the west.

What is an electric charge?

Due to the physical characteristic of electric charge, charged material experiences a force when it is exposed to an electromagnetic field. Electric charges can be positive or negative (commonly carried by protons and electrons respectively). While like charges repel one another, opposite charges attract. If an object has no net charge, we refer to it as neutral.

The charge on one electron is -1.6 ×10⁻¹⁹ coulomb.

As given in the problem statement when a positive charge is placed in an electric field that points west. the direction of the force on the positive particle will also point toward the west because for a positively charged

particle the direction of the electric field is the same as the force.

Thus, a positive charge is introduced into a westward-pointing electric field. the force acting on the positive particle points westward

Learn more about an electric charge from here

brainly.com/question/8163163

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The direction of the electric field is defined as the direction of the force on a
positive charge immersed in the field. The force on the particle points west.
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