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3 years ago

Why can't we outrun our shadow?

2 answers:

6 0

Shadows are created when light is blocked by a solid object, creating a dark spot in the shape of the object on the ground. In order to avoid photons interacting with one's body long enough to create a "gap" between your feet and the beginning of your shadow, you'd have to outrun the speed of light, which is approximately 300 million meters per second, a humanly impossible feat.

Hope this helps! :)

Slav-nsk [51]3 years ago

4 0

For the same reason you can't outrun your own feet.

Like your feet, your shadow is connected to you. When you run, you take your head, your shoulders, your knees, your feet, your toes, and your shadow along with you. Also, hopefully, your clothing. You never outrun any of these things.

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The length of a certain wire is doubled and at the same time its radius is also doubled. What is the new resistance of this wire

Leto [7]

Answer:

R' = R/2

Therefore, the new resistance of the wire is twice the value of the initial resistance.

Explanation:

Consider a wire with:

Resistance = R

Length = L

Area = A = πr²

where, r = radius

ρ = resistivity

Then:

R = ρL/A

R = ρL/πr² --------------- equation 1

Now, the new wire has:

Resistance = R'

Resistivity = ρ

Length = L' = 2 L

Radius = r' = 2r

Area = πr'² = π(2r)² = 4πr²

Therefore,

R' = ρL'/πr'²

R' = ρ(2 L)/4πr²

R' = (1/2)(ρL/πr²)

using equation 1:

R' = R/2

Therefore, the new resistance of the wire is twice the value of the initial resistance.

4 0

3 years ago

If a graduated cylinder has a current water level of 30 ml and you add an object which causes the water level to rise to 53 ml,

Katen [24]

Answer:

23L

Explanation:

Given that:

Initial volume of water = 30mL

Final volume of water after an object was placed on it = 53mL

The volume object added which resulted in a rise to 5mL will be :

Final Volume of object - Initial volume of object

53 mL - 30mL = 23mL

Hence, volume of object added is 23 mL

5 0

3 years ago

Bob is pulling a 30kg filing cabinet with a force of 200n , but the filing cabinet refuses to move. the coefficient of static fr

puteri [66]

The cabinet is being pulled with 200N and is being rested by a force equal to 200N. That is why it is not being moved.

Although the force of static friction can equal Fk=µs*F=m*g*µs=(30kg)*(9.8m/s^2)*(0.80)=235 N. It is not resisting the 200N force with 235N. Imagine if you pushed something with 200N and it pushed you back with 235N, especially a cabinet. You would think that the cabinet was alive.

8 0

4 years ago

If you hit another object with your vehicle, your _____ will be slowed or stopped by the force of impact caused by that object u

konstantin123 [22]

The answer is the vehicle. At the precise moment of the impact in a collision, there is the release of energy when a vehicle strikes another vehicle or another object. Earlier to an impact, a vehicle and everything inside the vehicle is traveling at whatever speed the vehicle had been going. As the collision continues, the vehicle slowly loses energy. However, the vehicle occupants and any others items in the vehicle continue to move forward at the same speed as the vehicle had been traveling prior to impact.

7 0

4 years ago

An object is moving at 100 m/s and comes to a stop in 25 seconds. What is its acceleration?

BARSIC [14]

Answer:

-4m/s²

Explanation:

a = Δv/t

Our change in velocity is equal to v₂-v₁, which in this equation is 0 m/s - 100 m/s, so our change in velocity is -100m/s. Now plug that and our time into the equation, like so:

a = (-100m/s)/(25s) a= -4m/s².

3 0

3 years ago