PLEASE HELPPPPPPP ASAPPPPPP

1 .

n200080 [17]

Answer:

1. Efficiency

2. Kinetic energy

3. Pulley

4. Screw

5. Wedge

Explanation:

1. Efficiency: the ratio of work output to work input or the ratio of actual mechanical advantage (AMA) to ideal mechanical advantage (IMA).

Mathematically, the efficiency of a machine is given by the formula;

$Efficiency = \frac {MA}{IMA} * 100$

2. Kinetic energy: the energy of a moving object. Kinetic energy (KE) is an energy possessed by an object or body due to its motion.

Mathematically, kinetic energy is given by the formula;

$K.E = \frac{1}{2}MV^{2}$

Where;

K.E represents kinetic energy measured in Joules.

M represents mass measured in kilograms.

V represents velocity measured in metres per seconds square.

3. Pulley: a grooved wheel over which a rope can move. It is made up of a wheel and rope which allows force to be multiplied such as in a drawing well.

4. Screw: a double-sided inclined plane. It is held in position and then used to tighten two or more objects together.

5. Wedge: an inclined plane wrapped around a cylinder. It can be used to split objects into halves.

4 0

3 years ago

What is the mass of a 50 kg person on earth?

olganol [36]

Answer:

a. 50 Kg hope it helps :)

3 0

3 years ago

B4-WWT03: OBJECT CHANGING VELOCITY-WORK

blsea [12.9K]

Answer:

Part A;

he mass of the object, m = 2 kg

The initial speed of the object, u = 3 m/s east

The final speed of the object, v = 7 m/s west

The initial kinetic energy of the object = 1/2 × m × u² = 1/2 × 2 × 3² = 9 Joules

The final kinetic energy of the object = 1/2 × m × v² = 1/2 × 2 × 7² = 49 Joules

Based on the change in the momentum produced by the force which changes the direction of the object, we add the two energy quantities to get the total change in energy as follows;

The change in kinetic energy = 9 J + 49 J = 58 J

The statement is wrong because the change in momentum brought about by the force should be included when finding the the total change in kinetic energy of the object during the 5 seconds period

Part B;

The kinetic energy, K. E. = 1/2 × m × v²

The kinetic energy of the car A = 1/2 × 1000 × 6² = 18,000 J

The kinetic energy of the car B = 1/2 × 1600 × 8² = 51,200 J

The kinetic energy of the car C = 1/2 × 1200 × 8² = 38,400 J

The kinetic energy of the car D = 1/2 × 1600 × 4² = 12,800 J

Given that work required = Force × Distance, and the distance, is constant, we have;

The force required is directly proportional to the energy kinetic energy of the car that is to be stopped

Therefore, we have;

B = 1, C = 2, A = 3, and D = 4

The work needed to stop the car, W = The strength of the applied force, F × The given constant distance to stop, d

∴ W ∝ F.

Explanation:

8 0

3 years ago

_____cells do not contain a nucleus

xeze [42]

Prokaryotic cells lack a nucleus.<span> Organisms classified as prokaryotes include bacteria and archaea. </span>

4 0

4 years ago

What is the acceleration??????

mr Goodwill [35]

Answer: Acceleration is a measure of how fast velocity changes. Acceleration is the change of velocity divided by the change of time. Acceleration is a vector, and therefore includes both a size and a direction. In short, acceleration is the rate at which speed changes.

6 0

3 years ago