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pickupchik [31]

3 years ago

10

Which statements are true about ionic compounds?A. An ionic compound can be named using prefixes.B. An ionic compound is made of

a positive cation and a negative anion.C. An ionic compound of two elements has three possible formulas.D. An ionic compound is made of a nonmetal and a metal.

1 answer:

Damm [24]3 years ago

5 0

The correct answer is d.

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A worker kicks a flat object lying on a roof. The object slides up the incline 10.0 m to the apex of the roof, and flies off the

11111nata11111 [884]

Answer:15.20 m

Explanation:

Given

initial velocity $(v_i)=15 m/s$

inclined length=10 m

$\mu _k=0.435$

inclination $\theta =43.5^{\circ}$

$F_{net}=f_r+mg\sin \theta$

$a_{net}=\mu _kg\cos \theta +g\sin \theta$

$a_{net}=0.435\times 9.8\times \cos 43.5+9.8\times \sin 43.5$

$a_{net}=3.09+6.74=9.83 m/s^2$

$v^2-u^2=2as$

$v^2=15^2-2\times (9.83)10$

$v=5.31 m/s$

So Particle launches with a speed of 5.31 m/s at an angle of \theta $=43.5$

$h_{max}=\frac{u^2\sin^2\theta }{2g}$

$h_{max}=\frac{(5.31)^2\sin ^2(43.5)}{2\times 9.81}$

$h_{max}=0.679$

Total height raised is $0.679+\frac{10}{\sin 43.5} =15.20 m$

6 0

3 years ago

A basketball has a mass of 609 g. Moving to the right and heading downward at an angle of 32° to the vertical, it hits the floor

andrezito [222]

Answer:1.549 kg-m/s

Explanation:

Given

mass of basketball =609 g

ball is moving downward right at an angle of $32 ^{\circ}$ with vertical

After hitting the floor it moves with a speed of 3 m/s

change in Momentum in x direction

$P_x=musin32\hat{i} -mvsin32\hat{i}$

where u=3m/s

v=3m/s

m=mass of ball

$P_x=0$

Change in momentum in Y-direction

$P_y=-mucos32\hat{j}-mvcos32\hat{j}=-2mvcos32$

$P_y=-1.549\hat{j} kg-m/s$

3 0

3 years ago

What factors have caused Earth to evolve over geologic time?

kow [346]

Earth, the planet:

1. Collision of Earth with Mars-sized planet.

2. Formation of the Moon and its gravitational effects.

3. Cooling and solidification of Earth's molten outer surface.

4. Period of intense asteroid bombardment.

5. Build-up of liquid water on Earth's surface.

6. Appearance of continents.

7. Start of plate tectonics.

8. Appearance of photosynthetic bacteria.

9. Change in atmosphere due to photosynthetic bacteria.

10. Widespread appearance of complex organisms.

11. Adaptation of plant and animal life to land.

12. Periods of intense, long-lasting volcanic activity.

13. Re-positioning of Earth's continents and oceans, and its

resultant effect on weather patterns and ocean circulation.

14. Changes in Earth's magnetic fields.

15. Changes in Earth's orientation to the sun.

16. Random devastating meteorite impacts.

17. Glaciations, floods, earthquakes.

Life: Abundance, Diversity and Extinction of different species in response to changing climatic, ecologic and edaphic conditions.

8 0

4 years ago

If the vector below is multiplied by 2, what will be its end point?

seropon [69]

The end point would be (4,-1).

<u>Explanation:</u>

When you multiply a vector with a scalar, it is known as a scalar multiplication. This multiplication is as simple as multiplying each component of the vector by the scalar because scalar is just another way to call a real number. The result of this multiplication is always a vector.

Multiplying a positive scalar larger than one will increase the magnitude of the vector, but not it's direction. A positive scalar smaller than one will decrease the magnitude. And negative scalar will reverse the direction and increase or decrease the magnitude depending on whether scalar is more than one or less than one.

6 0

3 years ago

A small block of mass 1.57 kg rests on the left edge of a block of length 3.45 m and mass 7.04 kg. the coefficient of kinetic fr

MariettaO [177]

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3 0

3 years ago