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4 years ago

8

a diver initially moving horizontally with speed v dives off the cliff and lands in the water a distance x feom the base. how fa

r feom the base would the diver lmhave landed if the diver initially had been moving horizontally with the speed of 2v

1 answer:

nlexa [21]4 years ago

5 0

He would have landed <em>2x </em> feom the base if his horizontal speed had been double.

That's because the time it takes him to drop from the cliff to the water is the same
in both cases, and the distance feom the base of the cliff to his splash-point is just ...

(his horizontal speed) x (his time falling through the air).

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What is energy converted to if it is not used to do work?

Romashka [77]

Answer:

the human body isn't very efficient at converting food into useful work. The human body is less than 5% efficient most of the time. The rest of the energy is converted to heat, which may or may not be useful, depending on how cool or warm a person wants to be.

Explanation:

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3 years ago

A firm receives an order for a square-base rectangular storage container with a lid. The container has a volume of 20 cubic mete

Stels [109]

Answer:$ 506.05

Explanation:

Given

volume of container $=20 m^3$

Let L be the length of square-base and h be the height of Rectangular box

Cost of base $=20 \$/m^2$

Cost of side and lid $=10 \$ /m^2$

Cost of base $c_1=L^2\times 20$

$h=\frac{20}{L^2}$

cost of lid and side $c_2=10\times 4L\cdot h+10\times L^2$

Total cost $C=c_1+c_2$

$C=20L^2+10L^2+40L\cdot h$

$C=30L^2+\frac{800}{L}$

differentiate C w.r.t to L to get minimum cost

$\frac{\mathrm{d} C}{\mathrm{d} L}=60L-\frac{800}{L^2}=0$

$L^3=\frac{80}{6}$

$L=2.37 m$

thus $h=\frac{20}{5.613}=3.56 m$

Thus Lowest cost is $C=30\times 5.617+\frac{800}{2.37}=$ 506.05$

4 0

3 years ago

Randall is 140 miles away from Gregory. They are traveling towards each other. If Gregory travels 4 mph faster than Randall and

mote1985 [20]

Answer:

8 mph, 12 mph

Explanation:

t = Time taken = 7 hours

x = Speed of Randall

x+4 = Speed of Gregory

The distance they both will travel together is 140 miles if they start at the same time.

$Distance=Speed\times time$

$(x+4)t+xt=140\\\Rightarrow (x+4)7+7x=140\\\Rightarrow 7x+28+7x=140\\\Rightarrow 28+14x=140\\\Rightarrow x=\dfrac{140-28}{14}\\\Rightarrow x=8\ mph$

The speed of Randall is 8 mph

The speed of Gregory is 8+4 = 12 mph

5 0

3 years ago

Explain the different types of motion of a sewing machine

Sladkaya [172]

I got the same answer as above. So she is correct.

Answer

Thus, the earth has three types of motion at the same time i.e. circular motion, periodic motion and rotational motion. ... So, the wheel of a sewing machine shows rotational motion. The sewing machine has also a needle which moves up and down continuously (as log as the wheel rotates).

7 0

3 years ago

Which of the following is true of an adiabatic process?

poizon [28]

Adiabatic process is that process in which heat of a closed system will remain conserved or we can say that system can not exchange its thermal energy from its surrounding

So here from 1st law of thermodynamics we can say

$\Delta Q = \Delta U + W$

since we know that

$\Delta Q = 0$

so we will have

$0 = \Delta U + W$

so we have

$-\Delta U = W$

so here correct answers are

<em>A. -ΔU = W </em>

<em>B. Heat is constant. </em>

7 0

4 years ago

Read 2 more answers