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Sidana [21]
3 years ago
8

A racecar driver circles a racetrack with a constant speed of 110 km/hr. Which BEST describes the speed and velocity of the car?

A) The speed and velocity remains constant. B) The speed is constant and velocity is changing. C) The speed has no impact on the velocity of the car. D) The velocity changes only if the car slows down or speeds up.
Physics
2 answers:
tangare [24]3 years ago
8 0
The answer is B, The speed is constant and the velocity is changing.
borishaifa [10]3 years ago
5 0

Answer:

B) The speed is constant and velocity is changing.

Explanation:

- Speed is a scalar quantity, which is equal to the ratio between the distance covered and the time taken. In this case, the speed is constant, and it is 110 km/h.

- Velocity is a vector quantity, which consists of a) a magnitude (which is the speed) and b) a direction. In this problem, the speed is constant, however the velocity is changing, because the direction of the car is changing at every moment (in fact, the track is a circle, so the direction is always changing).

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Which of these activities performed by a chemist is primarily based on an understanding of physics?
Yanka [14]
Predicting the volume of a gas, given its temperature and pressure p<span>roperties.</span>
4 0
4 years ago
A transformer has a primary voltage of 115 V and a secondary voltage of 24 V. If the number of turns in the primary is 345, how
Eduardwww [97]
Here's a fun and useful factoid:

               The ratio of the voltages on a transformer is the same
               as the ratio of the number of turns in each winding.

So the ratio of  (345 to the secondary turns)  is  (115V to 24V).

That's a proportion.

                 (115/24)  =  (345/x)

I'll bet you can take it and solve it from here.
Just cross-multiply in the proportion and etc. etc.
6 0
3 years ago
If the net force acting on a stationary object is zero, then the object will A. remain at rest. B. accelerate in the direction o
ra1l [238]

The object will remain at rest

Newton's first law states that if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.

Here net force is zero

An object with a net force of zero acting on it will remain at rest, if initially at rest, or it will maintain a constant velocity.

F=MA

Force F=0

Than Acceleration A=0

With zero Acceleration stationary object  will remain at rest.

Hence Remain at rest is the correct answer

Learn more about Newton's law of motion here

brainly.com/question/25545050

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6 0
2 years ago
The superheroine Xanaxa, who has a mass of 65.1 kg , is pursuing the 78.7 kg archvillain Lexlax. She leaps from the ground to th
klasskru [66]

Answer:

There is net loss of gravitational energy .

Explanation:

When Xanaxa is on the ground , her potential energy is assumed to be zero . When she leaps to a height of 153 m , she gains gravitational energy . When she dives and reaches the surface , she loses potential energy and on reaching the ground her potential energy becomes zero . When she further goes down inside ground to a depth of 17.5 m , she loses potential energy further . Her potential energy becomes less than zero or negative .

Ultimately her potential energy changes from zero to negative in the whole process . So there is net loss of potential energy .

8 0
3 years ago
Glycerin at a temperature of 30 degrees celcius flows at a rate of 8×10−6m3/s through a horizontal tube with a 30mm diameter. wh
MariettaO [177]

The pressure drop in pascal is 3.824*10^4 Pascals.

To find the answer, we need to know about the Poiseuille's formula.

<h3>How to find the pressure drop in pascal?</h3>
  • We have the Poiseuille's formula,

                      Q=\frac{\pi Pr^4}{8\beta l}

where, Q is the rate of flow, P is the pressure drop, r is the radius of the pipe, \beta is the coefficient of viscosity (0.95Pas-s for Glycerin) and l being the length of the tube.

  • It is given that,

                Q=8*10^{-6}m^3/s\\diameter=30mm, thus,\\r=15mm\\l=100m\\\beta =0.95

  • Thus, the pressure drop will be,

                P=\frac{8Q\beta l}{\pi r^4} =\frac{8*8*10^{-6}*0.95*100}{3.14*(15*10^{-3})^4} \\\\P=3.824*10^4Pascals.

Thus, we can conclude that, the pressure drop in pascal is 3.824*10^4 Pascals.

Learn more about the Poiseuille's formula here:

brainly.com/question/13180459

#SPJ4

3 0
1 year ago
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