All categories

3 years ago

¨selective breeding should be more tightly restricted¨- do you agree or disagree with this statement and whyyyyyyyyyyyyy¨

Physics

1 answer:

blagie [28]3 years ago

7 0

Answer:

disa gree animals should be aloud to mate with another animal of the same breed freely

Explanation:

You might be interested in

Two rockets are flying in the same direction and are side by side at the instant their retrorockets fire. Rocket A has an initia

Sedaia [141]

Answer:

$a_2\ =\ -33.65\ m/s^2$

Explanation:

Given,

For the first rocket,

Initial velocity of the first rocket A = $u_1\ =\ 4600\ m/s.$

Acceleration of the first rocket = $a_1\ =\ -18\ m/s^2$

For the second rocket,

Initial velocity of the second rocket B = $u_2\ =\ 8200 m/s.$
Displacement of both the rockets A and B = s = 0 m

Fro the first rocket,

Let 't' be the time taken by the first rocket A for whole the displacement

$\therefore s\ =\ u_1t\ +\ \dfrac{1}{2}a_1t^2\\\Rightarrow 0\ =\ 4600t\ -\ 0.5\times 18t^2\\\Rightarrow t\ =\ \dfrac{4600}{0.5\times 18}\\\Rightarrow t\ =\ 511.11 sec$

Let $a_2$ be the acceleration of the second rocket B for the same time interval

from the kinematics,

$\therefore s\ =\ ut\ +\ \dfrac{1}{2}at^2\\\Rightarrow s\ =\ u_2t\ +\ \dfrac{1}{2}a_2t^2\\\Rightarrow a_2\ =\ \dfrac{2s\ -\ 2u_2t}{t^2}\\\Rightarrow a_2\ =\ \dfrac{0\ -\ 2u_2t}{t^2}\\$

$\Rightarrow a_2\ =\ -\dfrac{2u_2}{t}\\\Rightarrow a_2\ =\ -\dfrac{2\times 8600}{511.11}\\\Rightarrow a_2\ =\ -33.65\ m/s^2$

Hence the acceleration of the second rocket B is -33.65\ m/s^2.

6 0

3 years ago

A closed cylindrical tank of radius 3.5 m and height 2m is made from

Dahasolnce [82]

Explanation:

Total surface area of cylinder:

$2\pi \times r(h + r) \\ 2 \times \pi \times 3.5(3.5 + 2) \\ 2\pi \times 19.25 = 120.951317 \\ 120.95 \: {cm}^{2}$

sheet of metal required = 120.95 cm^2

3 0

3 years ago

Read 2 more answers

30 minus 3 plus 4 is equal to what

Pepsi [2]

Answer:

Explanation:

quick maths

6 0

3 years ago

Read 2 more answers

How did the current change when the circuit was initially closed in Part 2 of this exercise? Explain your answer by referencing

Radda [10]

Answer:

Some current is lost.

Explanation:

Change occur in the current when the circuit was initially closed because in a closed circuit the current moves from the start towards the end of the circuit through various resistors. There is heat produced in the wire when the current flows through the circuit. Due to this heat, some of the current is lost during on his own way. Capacitor is a device used to store an electric charge, having of one or more pairs of conductors separated by an insulator. while on the other hand, electric current is a stream of charged particles, such as electrons moving through conductor or space.

7 0

3 years ago

what force is required to move a 25,000 kg vehicle from 0km/hr to 60km/hr in 20 seconds? (hint: convert to proper units, solve f

liq [111]

Let's first convert the initial and final speed of the vehicle in m/s:
$v_i = 0km/h = 0m/s$
$v_f = 60km/h \cdot \frac{1000 m/km}{3600 s/h} =16.67 m/s$

Therefore, the acceleration of the car is given by
$a= \frac{v_f-v_i}{t}= \frac{16.67 m/s-0 m/s}{20 s}=0.83 m/s^2$

And so now we can calculate the force required by using Newton's second law:
$F=ma=(25000 kg)(0.83 m/s^2)=20750 N$

4 0

4 years ago