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2 years ago

If you were stuck in the center of the bridge when it was swaying, where would be the safest place to walk back to land?

1 answer:

4 0

Straight
You already have to momentum of walking forward, and going back and forth are the same distance. If you go back then you would have to stop, turn and walk, but if you go forward you just have to walk.

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A 1000-kg car moving at 10 m/s brakes to a stop in 5 s. the average braking force is

Marina86 [1]

To calcculate the braking force of the car moving, we use Newton's second law of motion which relates the acceleration and the force of an object moving. The force of an object moving is directly proportional to its acceleration and the proportionality constant is the mass of the object. It is expressed as:

Force = ma

Acceleration is the rate of change of the velocity of a moving object. We calculate acceleration from the velocity and the time given above.

a = (10 m/s) / 5 s = 2 m/s^2

So,
Force = ma
Force = 1000 kg ( 2 m/s^2 )
Force = 2000 kg m/s^2 or 2000 N

4 0

2 years ago

5) The motion that repeats itself in equal intervals of time is called<br>olaration is equal to

kotykmax [81]

Answer:

the motion that repeat itself in equal interval of time is called periodic motion and it is equal to harmonic motion. for example pendulum

6 0

2 years ago

Cl has an atomic number of 17 and an atomic mass of 35. How many

lubasha [3.4K]

Answer:

7 Electrons

Explanation:

Assuming that final energy level is that same as valence shell, we first need to find how many of the electrics will be used to fill the ones before it.

Electron shell capacities are as follows :

First shell/Ebergy level: 2 electrons

Seconds shell/energy level : 8 electrons

Third shell /energy level :8 electrons

The first two shells total to 10, and the first three shells total to 18. Since chlorine (17) fills more than 2 shells but less that 3, the third one is its final energy level. We find the number in the final energy level by subtracting the 10 in the full first two. 2+8=10

17-10=7

Chlorine has 7 electrons on its final energy level.

Hope this helped!

3 0

1 year ago

An eagle is ﬂying horizontally at a speed of 3.00 m/s when the ﬁsh in her talons wiggles loose and falls into the lake 5.00m bel

Lilit [14]

Answer:

$v=10.34\frac{m}{s}\\\theta=73.14^\circ$

Explanation:

The velocity of the fish relative to the water when it hits the water is given by its magnitude and its angle:

$v=\sqrt{v_x^2+v_y^2}\\\theta=tan^{-1}(\frac{v_y}{v_x})$

The horizontal speed ( $v_x$ ) of the fish is constant, while vertically we have a free fall ( $v_{0y}=0$ ), using the kinematic equations we can calculate the vertical speed ( $v_y$ ):

$v_y^2=v_{0y}^2+2gh\\v_y^2=2gh$

Now, we calculate the velocity of the fish:

$v=\sqrt{v_x^2+2gh}\\v=\sqrt{(3\frac{m}{s})^2+2(9.8\frac{m}{s^2})(5m)}\\v=10.34\frac{m}{s}\\\theta=tan^{-1}(\frac{\sqrt{2gh}}{v_x})\\\theta=tan^{-1}(\frac{\sqrt{2(9.8\frac{m}{s^2})(5m)}}{3\frac{m}{s}})\\\theta=73.14^\circ$

8 0

2 years ago

The transfer of heat by the movement of a fluid is called

ikadub [295]

Answer:Convection

Explanation:

Convection is the heat transfer procedure by the movement of liquid or gas molecules. It is a combination of diffusion and bulk motion of molecules. Near the surface of the liquid diffusion process dominates while at certain height bulk motion of liquid dominates.

Convection can be

Natural
Forced

Natural : Natural convection occurs due to density differences

Forced: Force convection occurs when we apply external heat source.

8 0

2 years ago