Answer:
<h3>0.445</h3>Explanation:
In friction, the coefficient of friction formula is expressed as;
Ff is the frictional force = Wsinθ
R is the reaction = Wcosθ
Substitute inti the equation;
Given
θ = 24°
Hence the coefficient of kinetic friction between the box and the ramp is 0.445
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:
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=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= 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= 5,523.91 cents
Finally, if 100 cents is equal to 1 dollar, 5,523.91 cents, how many dollars are equal?
cost= 55.2391 $
<u><em> The cost of running the electric water heater for one year is 55.2391 $</em></u>
Answer:
halve the slit separation
Explanation:
As we know that
In YDS experiment, the equation of fringe width is as follows
where,
D denotes the separation in the middle of screen and slits
d denotes the distance in the middle of two slits
And to increase the Δx we have to decrease the d i.e, the distance between the two slits
Hence, the first option is correct