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4 years ago

Why car speed is not considered as car velocity?

Physics

1 answer:

grigory [225]4 years ago

4 0

Answer:

Cause its scalar quantity

Explanation:

since speed does not take directions into consideration, it is considered to be a scalar quantity. On the other hand, the velocity of an object does not take into account direction, thus making it a vector quantity.

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If the ball leaves the projectile launcher at a speed of 2.2 m/s at an angle of 30ᴼ, and the projectile launcher is on a table a

IgorC [24]

Answer: 1.12 m

Explanation:

This situation is related to parabolic motion, hence we can use the following equations:

$y=y_{o}+V_{o}sin \theta t-\frac{g}{2}t^{2}$ (1)

$x=V_{o} cos \theta t$ (2)

Where:

$y=0 m$ is the ball final height (when it hits the ground)

$y_{o}=1.1 m$ is the ball initial height

$V_{o}=2.2 m/s$ is the initial velocity

$\theta=30\°$ is the angle at which the ball was launched

$t$ is the time

$g=9.8 m/s^{2}$ is the acceleration due gravity

$x$ is the horizontal distance the ball travels

Rewriting (1) with the given values:

$0 m=1.1 m+(2.2 m/s)(cos 30\°)t-\frac{9.8 m/s^{2}}{2}t^{2}$ (3)

Multiplying all the eqquation by -1 and rearranging:

$4.9 m/s^{2} t^{2}-1.1 m/s t-1.1 m=0$ (4)

So, since we have a quadratic equation here (in the form of $0=at^{2}+bt+c$ , we will use the quadratic formula to find $t$ :

$t=\frac{-b\pm\sqrt{b^{2}-4ac}}{2a}$ (5)

Where $a=4.9$ , $b=-1.1$ , $c=-1.1$

Substituting the known values and choosing the positive result of the equation, we have:

$t=\frac{-(-1.1)\pm\sqrt{(-1.1)^{2}-4(4.9)(-1.1)}}{2(4.9)}$

$t=0.59 s$ (6)

Now, substituting (6) in (2):

$x=(2.2 m/s)(cos 30\°)(0.59 s)$ (7)

$x=1.12 m$ (8) This is the horizontal distance at which the ball hits the ground.

3 0

4 years ago

Gold is used to make a super thin layer on the visors of astronauts' helmets because of which property in particular?

8090 [49]

B, because gold is the most malleable substance of all.

7 0

3 years ago

Read 2 more answers

Show your work please

nekit [7.7K]

Answer:

$V = U + at$

Explanation:

Given the following data;

Initial velocity = 0 (since the stone is starting from rest).

Final velocity = 32 m/s

Acceleration = g = 10 m/s²

Time = 3.2 seconds

To show that the speed of the stone when it hits the ground is 32 m/s, we would use the first equation of motion;

$V = U + at$

Where;

V is the final velocity.
U is the initial velocity.
a is the acceleration.
t is the time measured in seconds.

Substituting into the formula, we have;

$32 = 0 + 10*3.2$

$32 = 0 + 32$

$32 = 32$

Proven: 32 m/s = 32 m/s

7 0

3 years ago

4. A car with a mass of 2,200 kg can accelerate from 0 to 30 m/s in 6 seconds.

wlad13 [49]

Answer:

The engine generates a force of 11000 Newtons.

Explanation:

To determine the force, first you will need to calculate the acceleration. Acceleration is change in velocity over change in time, so in this case:

$a = \frac{\Delta v}{\Delta t}=\frac{(30-0)\frac{m}{s}}{(6 - 0 )s}=5 \frac{m}{s^2}$

Force is then determined as

$F=ma = 2200kg\cdot 5\frac{m}{s^2}=11000N$

This is the forward force, i.a. one acting in the direction of the car's acceleration. we are told that there is no inefficiency in the engine and transmission, therefore this same force is generated by the engine.

4 0

3 years ago

Would you take a course/class in Positive Psychology, Why or why not?

defon

Answer:

Positive psychology is important because discovering what leads people to live more meaningful lives can translate to better strategies for managing mental illness, correcting negative behaviors, and increasing our happiness and productivity.

Explanation:

3 0

2 years ago

Why car speed is not considered as car velocity?​

Why car speed is not considered as car velocity?