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Natasha_Volkova [10]
3 years ago
14

An athlete runs four laps of a 400 m track. What is the athlete's total displacement?​

Physics
1 answer:
sasho [114]3 years ago
7 0

Answer:

○ 0 \checkmark

Explanation:

Even if the athelete runs four laps of a 400 m track, its displacement will be 0 because the displacement is the shortest distance from its to final position. And, here the final and initial position is same since he comes to its initial position after covering certain distance. So, displacement is 0.

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A car travels 15 kilometers west in 10 minutes. After reaching the destination, the car travels back to the starting point, agai
jeka94

Speed = (distance traveled) / (time to travel the distance).
 
Strange as it may seem, 'velocity' is completely different. 

Velocity doesn't involve the total distance traveled at all. 
Instead, 'velocity' is based on 'displacement' ... the distance
between the start-point and end-point, regardless of the route
taken to get there.  So the displacement in driving once around
any closed path is zero, because you end up where you started. 

Velocity =

           (displacement during some time)
divided by
            (time for the displacement)

AND the direction from the start-point to the end-point.


For the guy who drove 15 km to his destination in 10 min, and then
back to his starting point in 5 min, (assuming he returned by way of
the same 15-km route):

         Speed = (15km + 15km) / (10min + 5min)  =  (30/15) (km/min)

                                                                                 =  2 km/min.

        Velocity = (end location - start position) / (15 min)  =  Zero .

5 0
3 years ago
How much heat is required to convert 12.0 g of ice at -10.0°C to steam at 100.0°C. Express your answer in joules, calories, and
Kruka [31]
You can’t solve it because you don’t have c in the question
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2 years ago
Please do number 11 need this question bad
ArbitrLikvidat [17]

Gas always expands or contracts to exactly fill whatever you put it in.

So to measure the volume of a gas, just measure the volume of the jar, the tank, the bottle, the can, or the balloon that the gas is in.

6 0
3 years ago
The diffusion constant for oxygen diffusing through tissue is 1.0 × 10-11 m2/s. In a certain sample oxygen flows through the tis
Eduardwww [97]

Answer:

m' = 1 x 10⁻⁶ kg/s

Explanation:

Given that

Diffussion constant = 1 x 10⁻¹¹

Mass flow rate ,m = 2 x 10⁻⁶ kg/s

The diffusion is inversely proportional to the thickness of the membrane and therefore when the thickness is doubled, the mass flow rate would become half.

So new flow rate m'

m'=\dfrac{m}{2}

m'=\dfrac{2\times 10^{-6}}{2}\ kg/s

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6 0
3 years ago
Alice is going on a picnic and is aware that it will be easier to carry the picnic basket if it balances at the center where the
Maksim231197 [3]

Answer: 13.703cm from the center of the basket on the end holding the 0.675kg package of hot dog.

Explanation:

The center of the basket is at point 26 cm from each end of the basket.

This is gotten from the evaluation;

52cm/2.

The principle of moments is very important in solving this problem,

"The algebraic sum of all clockwise moments must be equal to he algebraic sum of all anticlockwise moments"

The statement above is the principle of moments.

Now to the question,

Since the acceleration due to gravity is assumed to be equal for all of the masses,

By intuition, the basket would tilt downwards on the end which holds the 1.65kg container of potato salad.

Consequently, to balance the basket 1.85kg container of lemonade must be placed at a distance, x from the center of the basket along the length of the basket (on the end holding the 0.675 package of hot dog).

Therefore, Taking moments about the center of the basket,

(1.65kg×26cm)=(0.675kg×26cm)+(1.85cm×xcm)

Therefore from the expression above, x = 13.703cm from the center on the basket on the side which holds the 0.675kg package of hot dog.

PS: The knowledge of moments of forces is very important in understanding machines especially those which are used for measuring weights relative to other weights.

8 0
3 years ago
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