Correct Answer: D. prevent chilling of the young.

Explanation

Option D is correct as the young need warmth to avoid cold.

Correct Answer: A. enjoyed ourselves

Correct Answer: A. Re-use of old password

Correct Answer: A. spruious

Correct Answer: B. 20%

Correct Answer: C. Mg, Sn and Fe

Correct Answer: A. 1 . 25 x 10⁴ W

Explanation

Here's how to calculate the power developed in the engine:

1. Identify the given information:

* Mass of the car (m) = 800 kg

* Initial speed (u) = 0 m/s (assuming the car starts from rest, which is standard for such problems unless stated otherwise)

* Final speed (v) = 25 m/s

* Time taken (t) = 20 s

2. Calculate the work done by the engine:

The work done by the engine goes into changing the kinetic energy of the car.

Work Done (W) = Change in Kinetic Energy (ΔKE)

W = KE_final - KE_initial

W = (1/2)mv^2 - (1/2)mu^2

Since u = 0 m/s:

W = (1/2) * 800 kg * (25 m/s)^2 - (1/2) * 800 kg * (0 m/s)^2

W = 400 kg * (625 m^2/s^2) - 0

W = 250,000 Joules (J)

3. Calculate the power developed:

Power (P) is the rate at which work is done (Work done per unit time).

P = W / t

P = 250,000 J / 20 s

P = 12,500 Watts (W)

4. Express the power in scientific notation and compare with options:

P = 1.25 x 10^4 W

Comparing this to the given options:

A. 1.25 x 10^4 W

B. 2.50 x 10^4 W

C. 1.25 x 10^6 W

D. 2.50 x 10^6 W

The calculated power matches option A.

The final answer is 1 . 25 x 10^4 W

Explanation

(a) Effects of rural-urban migration on agricultural production: (i) scarcity of labourers leading to high labour cost (ii) high cost of labour will lead to high cost of production (iii) decreased food and cash crop production (iv) decreased animal production (v) decrease in export and hence GDP (Gross Domestic Product) (vi) poor adoption of agricultural innovations.

(b)(i) Effect of demand on production given a constant supply situation: (1) increase in demand results in increase in agricultural production and (2) decrease in demand results in decrease in agricultural production. (ii) Effect of supply on production given a constant demand: (1) demand is directly proportional to income such that more demand means more income and (2) less demand leads to less income.

(c)(i) Effect of demand on farmers' income when price is constant: (1 )demand is directly proportional to income such that more demand means more income and (2) less demand leads to less income (ii) Effects of supply on farmer's income when demand is constant: (1) increased supply decreases income as prices fall and. the perishable produce will waste away and (2) decrease in supply leads to higher income as price rises.

(d) Roles of a manager in a farm enterprise: (1) plans when and what to produce/decision making (2) supervises the duties of staff (3) co-ordination of farm activities (4) ensures effective combination of resources (5) determines the quantity of and what to sell and buy/ farm gate price (6) determines for how much a produce should be sold (7) ensures adequate record keeping (8) supervises the accounting system (9) budgets for the farm (10) organizes various tasks of the farm enterprise.

Correct Answer: B. ignoring

Correct Answer: A. trading