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4 years ago

Which type of change occurs when the bonds between atoms or molecules change and a new substance forms?

Physics

2 answers:

Ket [755]4 years ago

6 0

C. Chemical

~Sarah Robinsen

Nadusha1986 [10]4 years ago

3 0

Answer:

C: Chemical

Hope this help !!!!

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What is the magnitude fnet of the net force on the car?

solniwko [45]

A car speeds up on how its built

7 0

3 years ago

Help me pls with physics!! -

Citrus2011 [14]

Answer:

good luck

Explanation:

46 i think

4 0

3 years ago

A gardener pushes a 20 kg lawnmower whose handle is tilted up 37∘ above horizontal. The lawnmower's coefficient of rolling frict

e-lub [12.9K]

Answer:

58.4 W

Explanation:

The speed of the lawnmower is constant: this means that its acceleration is zero, so the net force on it is zero.

The equation of the forces along the two directions therefore are:

- Perpendicular to the floor: $F sin \theta + R -mg =0$

- Parallel to the floor: $F cos \theta - \mu R = 0$

where

F is the push of the gardener

R is the normal reaction

m = 20 kg is the mass

g = 9.8 m/s^2 is the acceleration of gravity

$\mu=0.18$ is the coefficient of friction

$\theta=37^{\circ}$

Solving for R,

$R=mg-Fsin \theta$

Substituting into the other equation,

$F cos \theta - \mu (mg-Fsin \theta) = 0\\F cos \theta - \mu mg + \mu F sin \theta = 0\\F(cos \theta+\mu sin \theta)=\mu mg\\F=\frac{\mu mg}{cos \theta + \mu sin \theta}=\frac{(0.18)(20)(9.8)}{cos 37^{\circ}+0.18(sin 37^{\circ})}=38.9 N$

And the power he must supply therefore is the product of this force and the speed:

$P=Fv=(38.9)(1.5)=58.4 W$

7 0

4 years ago

Multiple choice 1. which of earth's spheres contains mountains, valleys, and other landscapes? (1 point

ycow [4]

Here are the answers:
1. Geosphere (though the term lithosphere is mostly used)
2. Both ice and wind (glaciers, and really strong winds)
3. Water
4. Its inertia (the Earth is constantly "falling" towards the Sun due to its gravitational pull, but its inertia helps the Earth from maintaining its orbit.)
5. The rotating Earth
6. one year
7. The equator
8. It depends on how much of the sunlit side of the Moon faces the Earth
9. When an object in space comes between the Sun and a third object
10. Differences in how much the Moon and the Sun pull on different parts of Earth
11. b. False
12. a. True

Hope my answers have come to your help.

4 0

3 years ago

What type of mechanical wave is carrying the sound wave through the medium of air?

Nutka1998 [239]

Longitudinal wave is a wave in which the motion of the medium's particles is parallel to the direction of the energy transport.

4 0

3 years ago