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3 years ago

What principle explains why lifting heavy objects is easier using ramps?

Physics

2 answers:

Anna11 [10]3 years ago

5 0

By using ramps you can easily push or pull the object up the ramp.

Nadya [2.5K]3 years ago

4 0

Answer:

Inclined Plane

Explanation:

An inclined plane, also known as a ramp, is a flat supporting surface tilted at an angle, with one end higher than the other, used as an aid for raising or lowering a load. The inclined plane is one of the six classical simple machines.

The basic principle of Inclined pane is as follows

W = F x D ( Force times Distance)

where W shows the word done.

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3.) A 20cm long tube has an inner diameter of 0.85cm and an outer

IceJOKER [234]

Answer:

The answer is below

Explanation:

The resistance of a conductor (R) is given by:

$R=\frac{\rho L}{A}\\\\where\ L \ is\ the\ conductor\ length\ and \ A\ is\ the\ cross\ sectional\ area$ and ρ is resistivity

The length = 20cm = 0.2 m

The tube has an outer diameter of 1.1 cm (0.011 m), hence the outer area is:

A₁ = π * diameter²/4 = π * 1.1²/4 = 0.000095 m²

The tube has an inner diameter of 0.85 cm (0.0085 m), hence the inner area is:

A₂ = π * diameter²/4 = π * 0.0085²/4 = 0.0000567 m²

The conductor area = outer area - inner area = 0.000095 m² - 0.0000567 m² = 0.0000383 m²

Hence, the resistance is:

$R=\frac{\rho L}{A} =\frac{1.7*10^{-8}*0.2}{0.0000383}=0.00009\ ohm$

7 0

3 years ago

If a cart of 8 kg mass has a force of 16 newtons exerted on it what is its acceleration?

ch4aika [34]

Assuming the cart rests on a perfectly smooth and horizontal surface, then we can apply Newton's second law,
F=ma => a=F/m

Acceleration, a = Force/mass = 16 N / 8 kg = 2 m/s^2

6 0

3 years ago

In amplitude modulation, which wave property remains constant?

NNADVOKAT [17]

The carrier frequency remains constant during amplitude modulation. :)

8 0

3 years ago

Suppose a vacuum cleaner uses 120 J of electrical energy is 45 J are used to pull air into the vacuum cleaner how efficient is t

Airida [17]

Very efficient because it uses less then half to do the action then the vacuum actually stores.

3 0

4 years ago

Estimate how fast your hair grows, in units of m/s, assuming it takes 30 days for your hair to grow 1 inch. note that 1 inch =2.

VashaNatasha [74]

Answer:

1. 9.8 x 10^-7 cm/s

2. 50970 L

Explanation:

time, t = 30 days = 30 x 24 x 60 x 60 seconds = 2592000 seconds

length of hair, d = 1 inch = 2.54 cm

rate of growth = length of hair grows per second = 2.54 / 2592000

= 9.8 x 10^-7 cm/s

Thus, the grown rate of hair is 9.8 x 10^-7 cm/s.

2. length of the pool, l = 15 feet

width of the pool, w = 15 feet

height of pool, h = 8 feet

Volume of the pool, V = length x width x height

V = 15 x 15 x 8 = 1800 ft^3

To convert ft^3 into m^3 , we use

1 ft = 0.3048 m

so, 1 ft^3 = (0.3048)^3 m^3 = 0.0283 m^3

So, 1800 ft^3 = 1800 x 0.0283 = 50.97 m^3

now, 1 m^3 = 1000 L

So, 50.97 m^3 = 50.97 x 1000 L = 50970 L

3 0

3 years ago