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4 years ago

There are many theories as to why ice ages occur. The currently accepted theory is that ice ages are caused by _____.

1 answer:

7 0

Earlier in the text this question is provided for, you should be able to find the passage, "The currently accepted theory attributes ice ages to small changes in Earth's orbit, known as Milankovitch cycles. These cycles describe how Earth's orbit gradually changes shape from more circular to more elliptical and back again. This happens roughly every 100,000 years. The orbital changes take Earth nearer and further from the Sun, which would affect the amount of energy reaching Earth."

Answer: Small changes in Earth's orbit

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A child's toy consists of a spherical object of mass 50 g attached to a spring. One end of the spring is fixed to the side of th

Artemon [7]

Answer:

0.14 J

Explanation:

The maximum velocity is the amplitude times the angular frequency.

vmax = Aω

ω = vmax / A

ω = (3.2 m/s) / (0.06 m)

ω = 53.3 rad/s

For a spring-mass system:

ω = √(k / m)

ω² = k / m

k = ω²m

k = (53.3 rad/s)² (0.050 kg)

k = 142 N/m

The elastic potential energy is:

EE = ½ kx²

EE = ½ (142 N/m) (0.044 m)²

EE = 0.14 J

6 0

3 years ago

An electric water heater consumes 2.5 kW for 1.9 h per day.

Alecsey [184]

Answer:

The cost of running the electric water heater for one year is 55.2391 $

Explanation:

The simple rule of 3 helps to quickly solve proportionality problems when you have three known values and one unknown. If two quantities are directly proportional (that is, when multiplying or dividing one of them by a number, the other is multiplied or divided respectively by the same number) the rule of three can be applied as follows:

a ⇒ b

c ⇒ x

So: $x=\frac{c*b}{a}$

where a, b and c are the known values and x is the value you want to find out.

In this case, you can first apply the following rule of three: if 2.5 kW are consumed in 1.9 hours, in 1 hour how many kW are consumed?

$kWh=\frac{1 h*2.5 kW}{1.9 h}$

kWh=1.316

So an electric water heater consumes 1.316 kWh in one day. You apply another simple rule of three: if the heater in 1 day consumes 1.316 kWh, in 365 days (1 year) how many kWh are consumed?

$kWh=\frac{365 days*1.316 kWh}{1 day}$

kWh= 480.34

So an electric water heater consumes 480.34 kWh in a year.

If 1 kWh costs 11.5 cents, 480.34 kWh how many cents does it cost?

$cost=\frac{480.34 kWh*11.5 cents}{1 kWh}$

cost= 5,523.91 cents

Finally, if 100 cents is equal to 1 dollar, 5,523.91 cents, how many dollars are equal?

$cost=\frac{5,5523.91 cents*1 dollar}{100 cents}$

cost= 55.2391 $

<u><em> The cost of running the electric water heater for one year is 55.2391 $</em></u>

5 0

3 years ago

A 1.8 kg book has been dropped from the top of the football stadium. Its speed is 4.8 m/s when it is 2.9 meters above the ground

Alexus [3.1K]

Answer:

Answer:

72.936 Joule

Explanation:

Mechanical Energy = Potential Energy + Kinetic Energy

Kinetic Energy = (1/2) x m x V² = (1/2) x 1.8 x 4.8² = 20.736 J

Potential Energy = m x g x h = 1.8 x 10 x 2.9 = 52.2 J

Total Mechanical Energy = 20.736 + 52.2 = 72.936 Joule

Explanation:

8 0

3 years ago

As water heats in a pot on a stove, it might produce some mist above its surface right before the water begins to roll. What is

mr_godi [17]

When a liquid is heated, the molecules gain kinetic energy. As the liquid begins to boil they have enough energy to break the intermolecular attractions between their neighbors. This happens first at the surface before the volume below has enough energy to boil. Thus you see high energy water molecules escaping from the surface as mist.

4 0

4 years ago

Read 2 more answers

First class second class or third class lever

Black_prince [1.1K]

Answer:

the lever in which the fulcrum lies in middle is first

7 0

4 years ago

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