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BabaBlast [244]
3 years ago
9

A car moves with an average speed of 45 miles/hour. How long does the car take to travel 90 m

Physics
2 answers:
STALIN [3.7K]3 years ago
8 0
It would take 2 hours
Annette [7]3 years ago
6 0
B is the right answer
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The table below lists the speed that sound travels through four different materials.One of these materials is a gas, two are liq
Firdavs [7]

In order to find the solid, you would want the object in which sound travels the fastest

In this case, since in object C, the speed of sound is the fastest, it is the most likely to be a solid

So object C is most likely to be a solid

5 0
1 year ago
Which situation is most likely to lead to improving a scientific theory?
Nonamiya [84]

Answer:

A. Repeating an experiment to verify results

Explanation:

A scientific theory may be defined as the theory of science that is a thought out explanation of the observations done in the nature or that happens in the natural world. They are constructed using several scientific methods by observing many facts and hypothesis.

According to the question, repeating of an experiment a number of times and verifying its result may help in improving a scientific theory as if we get the similar result for each experiments, then it confirms the basis of the hypothesis or the facts that are observe in the nature and conclude a scientific theory.

4 0
3 years ago
Children slide down a frictionless water slide that ends at a height of 1.80 m above the pool. If a child starts from rest at po
Lerok [7]

Answer:

h = 1.75 m

Explanation:

As we know that height of the slide is given as

h = 1.80 m

so time taken by the child to hit the water from the slide is given as

t = \sqrt{\frac{2h}{g}}

now we will plug all data in it

t = \sqrt{\frac{2(1.80)}{9.81}}

t = 0.605 s

now we know that the horizontal distance moved by it is given as

L = v_x t

3.55 = 0.605 v_x

v_x = 5.86 m/s

now by energy conservation

mgh = \frac{1}{2}mv^2

so height of point A is given as

h = \frac{v_x^2}{2g}

h = \frac{5.86^2}{2(9.81)}

h = 1.75 m

3 0
3 years ago
Two massive objects are fixed in position. A third object is placed directly between the first two at the position at which the
ivanzaharov [21]

Answer:

Explanation:

Be M1 and M2 the two massive objects and m the third one

The gravitational force over the third object at the beginning is zero (assuming that the position of the third object is x=0)

F_{m}=-G\frac{mM_{1}}{x_{1}^{2}}-G\frac{mM_{2}}{x_{2}^{2}}=0

when the third object is displaced we have that the new position is x=Δx. Hence

F_{m}=-G\frac{mM_{1}}{(-x_{1}+\Delta x)^{2}}-G\frac{mM_{2}}{(x_{2}-\Delta x)^{2}}

I attached a scheme of the system

I hope this is useful for you

Regards

5 0
2 years ago
Un ascensor sube con una velocidad constante de 2 m/s. Un niño que va en el ascensor lanza una piedra de 0.6 kg hacia arriba con
Natasha_Volkova [10]

Answer:

W = 7.5 J

Explanation:

W = KE

W = ½mv² = ½0.6(5²) = 7.5 J

Niño, piedra y ascensor están todos en el mismo marco de referencia inercial.

los 2 m / s no son importantes.

6 0
3 years ago
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