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2 years ago

Electric kettle with the resistance of 20-02.is used-to-heat:4 kg of water. If

Physics

1 answer:

jeka942 years ago

5 0

The guy that answered this is fake and he’s doing it for free points so
Just repost it and hope he doesn’t find it

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Isla’s change in velocity is 30 m/s, and Hazel has the same change in velocity. Which best explains why they would have differen

Mashcka [7]

Answer:

The answer is B) Isla had a different time than hazel

Explanation:

5 0

3 years ago

A blue car pulls away from a red stop-light just after it has turned green with a constant acceleration of 0.2 m/s2. A green car

jolli1 [7]

Answer:

After 15 seconds, the green car will catch up with the blue car

Explanation:

Let the time for the green car to catch up with the blue car be T

When the green car catches up to the blue car, the distances covered by each car after time T will be equal. Also, their velocities at that instant will be equal

Distance covered by blue car after time T is given by: s = ut + 0.5 at²

Where u = 0, a = 0.2 m/s², t = T

S = 0.5 × 0.2 × T² = 0.1 T²

Velocity of blue car, v = u+ at

v = 0.2T

Distance covered by green car at T is given as: S = Velocity × time

Where v = 0.2T, t = T - 7.5 (since the blue car started 7.5 seconds earlier)

S = 0.2T (T - 7.5)

S = 0.2 T² - 1.5T

Equating the distance covered by the two cars

0.2T² - 1.5T = 0.1T²

0.1T² - 1.5T = 0

T(0.1T - 1.5) = 0

T = 0 or

T = 1.5/0.1 = 15 secs

Therefore, after 15 seconds, the green car will catch up with the blue car

8 0

2 years ago

Please I need help on this one kinda lost on it

Vanyuwa [196]

Check the 1st 2nd 3rd and 4th boxes

8 0

3 years ago

Why does a lorry travelling at 30mph have more kinetic energy than a car travelling at the same velocity?

rjkz [21]

Answer:

Because it has more mass

Explanation:

To understand this, think about the equation of kinetic energy

KE = $\frac{1}{2}$ m $v^{2}$

Kinetic energy depends on both the velocity (v) as well as the mass (m).

Because a lorry is bigger and heavier than a car, it will have more mass. With more mass, at the same velocity the lorry with have more kinetic energy.

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3 years ago

I am Pushing down at a 20

s344n2d4d5 [400]

Answer:

hivhhhh

Explanation:

iiiiuuuujrurj

7 0

2 years ago