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3 years ago

18. A swimmer steps out of a swimming pool into a light breeze. Why does

1 answer:

OverLord2011 [107]3 years ago

6 0

When the swimmer gets out, the water on her skin begins to evaporate. This process requires takes a lot of energy and that energy comes from the heat of her body. This is similar to when someone sweats. Hope this helps!

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A car drives 23m/s east for 35 seconds. What is the displacement?

Lina20 [59]

Answer:

805m

Explanation:

Speed = displacement/time

Speed = 23m/s

Time = 35s

Displacement = speed × time

= 23 × 35

= 805m

5 0

3 years ago

Compute the voltage drop along a 26-m length of household no. 14 copper wire (used in 15-A circuits). The wire has diameter 1.62

zepelin [54]

Answer:

V= 2.7 [v]

Explanation:

The value of the resistance is given by:

$R=L*\frac{Rho}{A}\\\\where:\\R=resistance\\L=Lenght\\Rho=Resistivity\\A=Transversal -Area$

so:

$R=26m*\frac{(1.68*10^{-8}ohm*m)}{\pi *(\frac{1.628*10^{-3}m}{2})^2}\\R=0.21 Ohm$

We can calulate the voltage dropped using the Ohm's law:

$V=I*R\\V=13A*0.21Ohm=2.7V$

8 0

3 years ago

Two stones are launched from the top of a tall building. One stone is thrown in a direction 15.0 ∘∘ above the horizontal with a

dolphi86 [110]

Answer:a

Explanation:

Given

First stone is thrown $15^{\circ}$ above the horizontal with some speed let say u

Second stone is thrown at $15^{\circ}$ below the horizontal with speed u

For a height h of building

For first stone (motion in vertical direction)

using

$v^2-u^2=2ah$

where v=final velocity

u=initial velocity

a=acceleration

h=displacement

$h=u\sin 15(t_1)-\frac{1}{2}gt_1^2---1$

For second stone

$h=(-u\sin 15)(t_2)-\frac{1}{2}gt_2^2----2$

Equating 1 and 2

$u\sin 15(t_1+t_2)-\frac{1}{2}g(t_1-t_2)(t_1+t_2)=0$

$(t_1+t_2)[u\sin 15-4.9(t_1-t_2)]=0$

as $t_1+t_2$ cannot be zero

so $t_1-t_2=1.05\ s$

$t_1=t_2+1.056$

therefore time taken by first stone(thrown upward) will be more.

7 0

3 years ago

Read 2 more answers

A force of 5 N gives to mass my and an acceleration of 8m/s2 and a mass m2

Papessa [141]

Answer:

a=6m/sec²

Explanation:

f=5 N

a1=8m/sec²

a2=24m/sec

m1=f/a1=5/8kg

m2=f/a2=5/24kg

New, f=(m1+m2)a

a=5/5/8+5/24=5/15+5/24=24*5/20

a=6m/sec²

4 0

3 years ago

The mass and volume of an unknown pure metal block are measured in laboratory. Mass is 100 g, and volume is 11.2 cm3. What is th

Ksju [112]

Answer:

density ρ = mass / volume

ρ = 100 g / 11.2 cm^3 = 8.93 g/cm^3

Probably copper because a value given for Cu is 8.89 g/cm^3

3 0

2 years ago