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3 years ago

Porque es un bioelemento el zinc?

1 answer:

5 0

Answer: EL ZINC ES EL ELEMENTO PURO PORQUE NO HA REACCIONADO CON NINGÚN OTRO METAL O NO METAL. EL SULFURO DE ZINC ES UN COMPUESTO PORQUE HA REACCIONADO CON EL AZUFRE PARA HACER EL COMPUESTO.

english:

ZINC IS THE PURE ELEMENT BECAUSE IT HAS NOT REACTED WITH ANY OF OTHER METAL OR NONMETAL. ZINC SULPHIDE IS A COMPOUND BECAUSE IT HAS REACTED WITH SULPHUR TO MAKE COMPOUND.

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After a 0.320-kg rubber ball is dropped from a height of 19.0 m, it bounces off a concrete floor and rebounds to a height of 15.

GarryVolchara [31]

Answer:

$Imp = 11.666\,\frac{kg\cdot m}{s}$

Explanation:

Speed experimented by the ball before and after collision are determined by using Principle of Energy Conservation:

Before collision:

$(0.32\,kg)\cdot (9.807\,\frac{m}{s^{2}} )\cdot (19\,m) = \frac{1}{2}\cdot (0.320\,kg)\cdot v_{A}^{2}$

$v_{A} \approx 19.304\,\frac{m}{s}$

After collision:

$\frac{1}{2}\cdot (0.320\,kg)\cdot v_{B}^{2} = (0.32\,kg)\cdot (9.807\,\frac{m}{s^{2}} )\cdot (15\,m)$

$v_{B} \approx 17.153\,\frac{m}{s}$

The magnitude of the impulse delivered to the ball by the floor is calculated by the Impulse Theorem:

$Imp = (0.32\,kg)\cdot [(17.153\,\frac{m}{s} )-(-19.304\,\frac{m}{s} )]$

$Imp = 11.666\,\frac{kg\cdot m}{s}$

5 0

3 years ago

Read 2 more answers

What are the characteristics of weight

Arlecino [84]

Shape or texture...im just try....

4 0

4 years ago

A student is using a metal wire to toast marshmallows in a campfire. Which statement best explains why the wire feels hot after

Licemer1 [7]

Answer:

Heat is transferred from the fire through the wire by conduction.

Explanation:

8 0

3 years ago

Using the projectiles equations for y and x at what second does the ball have a vertical velocity of -39.2 m/s^2

vovangra [49]

Answer:

Explanation:

In projectile the time taken by an object to reach its maximum height is the maximum time (tmax).

tmax = Usin $\theta$ /g

U = velocity of the ball

$\theta$ = angle of projection = 90° (vertical velocity)

g = acceleration due to gravity = 9.8m/s²

tmax = Usin90°/9.8

tmax = U/9.8

T the maximum height U = Uy = 39.2 m/s²

tmax = 39.2/9.8

tmax = 4secs

To calculate the time at which the ball will have an horizontal velocity, we will use the same formula but $\theta$ will be 0° in this case

If Ux = Ucos $\theta$

8 = Ucos0

U = 8m/s

Since t = Usin $\theta$ /g

t = 8sin0/9.8

t = 0sec

8 0

3 years ago

A uniform horizontal strut weighs 400.0 N. One end of the strut is attached to a hinged support at the wall, and the other end o

Olegator [25]

Answer:

Explanation:

Given

Weight of strut $W_1=400 N$

Weight of sign Board $W_2=200 N$

In this question angle which cable makes with horizontal is not given so

assuming $\theta =30^{\circ}$

From Diagram

Moment about hinge point

$T\sin 30\times L=W_1\times \frac{L}{2}+W_2\times L$

$T\sin 30=\frac{W_1}{2}+W_2$

$T\sin 30=\frac{400}{2}+200$

$T=800 N$

$\sum F$ in x direction is zero

$F_x=T\cos 30$

$F_x=800\cos 30=346.41 N$

$\sum F$ in Y direction is zero therefore

$F_y+T\sin 30=W_1+W_2$

$F_y=400+200-800\cdot \sin 30$

$F_y=200 N$

$F_{net}\ at\ hinge=\sqrt{F_x^2+F_y^2}$

$F_{net}=399.99\approx 400 N$

6 0

3 years ago