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3 years ago

29 Family planning is a practice of regulating the number or spacing of offspring through the use of birth control.

Physics

1 answer:

Mandarinka [93]3 years ago

8 0

I am pretty sure the answer is C) fertility awareness

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34. A train, starting from rest, accelerates along the platform at a uniform rate of 0.6 m/s2. A passenger standing on the platf

ira [324]

Answer:

4.08 s

Explanation:

Let the passenger took "t" time to catch the train

so in this case the total distance moved by the train + 5 m = total distance moved by the passenger

so we will have

distance moved by train is given as

$d_1 = \frac{1}{2}(0.6) t^2$

also the distance moved by passenger

$d_2 = \frac{1}{2}(1.2) t^2$

so we will have

$d_1 + 5 = d_2$

$0.3 t^2 + 5 = 0.6 t^2$

$0.3 t^2 = 5$

t = 4.08 s

3 0

3 years ago

A ticker timer makes 50 dots per second. When a body is pulled by a tap through the timer, the distance between the third and fo

fenix001 [56]

Answer:

The acceleration is 1 cm/s^2.

Explanation:

The acceleration is defined as the rate of change of velocity.

Here, initial velocity, u = 3/1 = 3 cm/s

final velocity, v = 4/1 = 4 cm/s

time, t = 1 s

Let the acceleration is a.

Use first equation of motion

v = u + at

4 = 3 + 1 x a

a = 1 cm/s^2

8 0

2 years ago

3. According to the Guinness Book of Records the heaviest baby ever born weighed 29 lbs 4 oz. (29.25 lbs).

Alexxandr [17]

Answer: 13.2678 kg

Explanation: Well, 13.2678 kg is 29.25 in mass and kg.

6 0

3 years ago

You have your bicycle upside down for repairs, with is 66.0 cm diameter wheel spinning freely at 230 rpm. The wheel's mass is 1.

rosijanka [135]

Answer:

$\omega_f = 17.86\ rad/s$

Explanation:

given,

dia of wheel = 66 cm

radius = 33 cm = 0.33 m

mass of wheel = 1.90 Kg

speed of wheel = 230 rpm

time to hold the tire = 3.10 s

Normal force = 2.7 N

coefficient of friction = 0.46

final angular speed = ?

we know

F = μ N

F = 0.46 x 2.7 = 1.242 N

torque

τ = F r

τ = 1.242 x 0.33 = 0.409 Nm

moment of inertia for wheel

I = MR²

I = 1.90 x 0.33²

I = 0.2069 kg m²

we now,

τ = I x α

$\alpha = \dfrac{\tau}{I}$

$\alpha = \dfrac{0.409}{0.2069}$

α = 1.981 rad/s²

we know,

$\omega_f - \omega_i = \alpha\ t$

$\omega_f - (230\dfrac{2\pi}{60}) =- 1.981 \times 3.1$

$\omega_f - 24 = - 6.14$

$\omega_f = 17.86\ rad/s$

7 0

2 years ago

At which of the following angles will the sunlight received at a location on Earth spread out over the largest area?

yarga [219]

10 degrees, because 0 degrees will receive the most sunlight, and 10 degrees is closest to 0 degrees.

5 0

3 years ago

Read 2 more answers