Answer:
the given statement is False
Explanation:
given,
distance of the trail = 2000 miles long
each rider traveled = 100 miles
every fresh horse travel = 10 miles
to maintain speed of = 10 mile/hr
the given statement is
150 horses is used for each delivery.
if each horse is allowed to travel 10 miles to travel
distance traveled using 150 horses = 150 x 10
= 1500 miles
to travel 2000 miles horse required is equal to 200.
so, the given statement is False
Answer;
<u>= 56.96 mA</u>
Explanation;
From the Ohm's law;
V = IR, where V is the potential difference in volts, I is the electric current in amperes and R is the resistance in ohms.
V = 4.5 volts, R = 79 Ω
Making I the subject of the formula we get;
I =V/R
= 4.5 /79
= 0.05696 A
But, 1 A = 1000 mA
Thus; 0.05696 × 1000
<u>= 56.96 mA</u>
Answer:
310.5 J
Explanation:
The total work done by Martha is equal to the increase in gravitational potential energy of the package, which is equal to
where
(mg) = 45 N is the weight of the package
is the increase in height of the package
The package is carried up 3 flights of stairs, each one with a height of 2.3 m, so the total increase in heigth is
And so, the work done by Martha is
The short answer is that the displacement is equal tothe area under the curve in the velocity-time graph. The region under the curve in the first 4.0 s is a triangle with height 10.0 m/s and length 4.0 s, so its area - and hence the displacement - is
1/2 • (10.0 m/s) • (4.0 s) = 20.00 m
Another way to derive this: since velocity is linear over the first 4.0 s, that means acceleration is constant. Recall that average velocity is defined as
<em>v</em> (ave) = ∆<em>x</em> / ∆<em>t</em>
and under constant acceleration,
<em>v</em> (ave) = (<em>v</em> (final) + <em>v</em> (initial)) / 2
According to the plot, with ∆<em>t</em> = 4.0 s, we have <em>v</em> (initial) = 0 and <em>v</em> (final) = 10.0 m/s, so
∆<em>x</em> / (4.0 s) = (10.0 m/s) / 2
∆<em>x</em> = ((4.0 s) • (10.0 m/s)) / 2
∆<em>x</em> = 20.00 m
