A cannon is shot from a boat at 185 m/s at a 52.2 angle. How far away does it land?

Since most people who are electrocuted don’t blow up, what kills them?

r-ruslan [8.4K]

They are killed mostly by heart attacks. Alternating electrical current interferes with the electrical pulses of the heart produced by the Sino-atrial node hence cause the heart to beat erratically and hence a heart attack and death to result. 7 milliamps to your heart for 3 seconds can cause it to be arrhythmic.

8 0

4 years ago

It’s estimated that there are a trillion comets in the Oort cloud, which extends out to about 50,000 AU.How much space does each

dexar [7]

Answer:

Each comet has 523 UA³
The typical spacing would be 8.05 UA
2.0181x10^21 Joules

Explanation:

Assuming comets are evenly distributed we can find first the volume of a sphere with the formula frac{{4}{3}}πr³ using 50000 as the radius, and then dividing this volume by the amount of comets. This gives a the space each comet has on average.
We apply the cube root as proposed in the question.
The kinectic energy is given K=frac{{1}{2}}mv² where m is the mass and v is the velocity. Apropriate unit are given in the question.

5 0

4 years ago

What hormone is not related to stress

viktelen [127]

The answer would be Estrogen, because that is a female sex hormone

8 0

4 years ago

Air at 20ºC with a convection heat transfer coefficient of 20 W/m2·K blows over a pond. The surface temperature of the pond is 2

dimulka [17.4K]

Answer:

The heat flux between the surface of the pond and the surrounding air is 60 W/ $m^{2}$

Explanation:

Heat flux is the rate at which heat energy moves across a surface, it is the heat transferred per unit area of the surface. This can be calculated using the expression in equation 1;

q = Q/A ...............................1

since we are working with the convectional heat transfer coefficient equation 1 become;

q = h ( $T_{sf} -T_{sd}$ ) ........................2

where q is the heat flux;

Q is the heat energy that will be transferred;

h is the convectional heat coefficient = 20 W/ $m^{2}$ .K;

$T_{sf}$ is the surface temperature = $23^{o}$ C 23°C + 273.15 = 296.15 K;

$T_{sd}$ is the surrounding temperature = $20^{o}$ C = 20°C + 273.15 = 293.15 K;

The values are substituted into equation 2;

q = 20 W/ $m^{2}$ .K ( 296.15 K - 293.15 K)

q = 20 W/ $m^{2}$ .K ( 3 K)

q = 60 W/ $m^{2}$

Therefore the heat flux between the surface of the pond and the surrounding air is 60 W/ $m^{2}$

3 0

4 years ago

An object is dropped from a bridge. A second object is thrown downwards 1.0 s later. They both reach the water 20 m below at the

olga2289 [7]

Answer:

vi = 14.610

Explanation:

initial velocity of the first object (vi) = 0 m/s, because it was dropped

distance (y) = -20 m

initial position (y0) = 0 m

acceleration due to gravity (g) = -9.8 m/s^2

y = 1/2 gt^2 + vi*t + y0

-20 = 1/2(-9.8)t^2 + 0 + 0

-20 = -4.9t^2

4.081 = t^2

+√4.081 = t

t = 2.020

time of second object = 2.020 - 1 = 1.020

Now we can plug in the new time to solve for vi of the second object.

y = 1/2 gt^2 + vi*t + y0

-20 = 1/2(-9.8)1.020^2 + vi*1.020 + 0

-20 = -5.098 + 1.020vi

14.902 = 1.020vi

vi = 14.610 m/s

6 0

3 years ago