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3 years ago

6) A stone is thrown vertically upward and returns to its starting position in o 5 s,What was its initial velocity?

Physics

1 answer:

NikAS [45]3 years ago

3 0

25m/s if you are using -10 as gravity

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6. The momentum of a 30.0 g bird with a speed of 12 m.s-1 is 0.36 kg.m.s-1. What will be its momentum 12s later if a constant .0

Keith_Richards [23]

Answer:

Explanation:

initial momentum = .36 kg.m.s⁻¹

negative impulse = force x time = .02 x 12 = .24 kg.m.s⁻¹

final momentum - initial momentum = impulse

final momentum = initial momentum + impulse

= .36 - .24

= .12 kg.m.s⁻¹

7 0

3 years ago

Can a small child play with a fat child on a see saw? explain how?

yuradex [85]

Closer u get 2 the center the more balanced out your weight will b

6 0

3 years ago

Read 2 more answers

Question 3 (1 point)

Butoxors [25]

Answer:

<em>The green car had the greatest momentum</em>

Explanation:

<u>Momentum</u>

Momentum can be defined as "mass in motion" and is calculated as the product of the mass of the object by its velocity.

Being v the magnitude of the velocity and m the mass of the object, the momentum is calculated with:

p = mv

The green car had a mass of m1=1200 kg and crossed the finish line at v1=53 m/s. Hence, its momentum was:

p1 = 1200 Kg * 53 m/s = 63600 Kg.m/s

The red car had a mass of m2=1100 kg and crossed the finish line at v2=55 m/s. Hence, its momentum was:

p2 = 1100 Kg * 55 m/s = 60500 Kg.m/s

Since p1 > p2, then the green car had the greatest momentum

8 0

3 years ago

A skier is standing still on a flat area of snow.

Anna11 [10]

Force=550N
Area=0.015m^2

We know

$\boxed{\sf Pressure=\dfrac{Force}{Area}}$

$\\ \sf\longmapsto Pressure=\dfrac{550}{0.015}$

$\\ \sf\longmapsto Pressure=36666Pa$

$\\ \sf\longmapsto Pressure=36666N/m^2$

Most nearest value is 37000N/m^2

Hence option b is correct

8 0

3 years ago

Two cylindrical resistors are made from same material and have the same length. When connected across the same battery, one diss

Ilia_Sergeevich [38]

Answer:

$\frac{d_2}{d_1} = \sqrt2 = 1.41$

Explanation:

As resistor is connected to the battery of constant EMF then the power across the resistor is given as

$P = \frac{E^2}{R}$

now if two resistors are made up of same material and of same length then due to different cross sectional area they both have different resistance

Due to different resistance they both will have different power

Since power is inversely depends on the resistance

So if the power is twice that of the other then the resistance must be half

so we have

$R_1 = \rho \frac{L}{A_1}$

$R_2 = \rho\frac{L}{A_2}$

since one resistance is half that of other resistance

So the area of one must be twice that of other

so we have

$\frac{A_2}{A_1} = 2$

$\frac{\pi d_2^2}{\pi d_1^2} = 2$

$d_2 = 1.41 d_1$

8 0

3 years ago