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3 years ago

True or False: An object can only have four forces acting on it at a time. Explain your reasoning.

2 answers:

5 0

False because there are many more forces that can act on one thing at one time or can have less than four at one time. This is just a law of physics.

Alexandra [31]3 years ago

3 0

That's an untrue statement.

The rope in a tug-o-war may have two or three HUNDRED forces on it, all at the same time.

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A man 6 feet tall walks at a rate of 5 feet per second away from a light that is 15 feet above the ground. When he is 10 feet fr

harina [27]

Answer:

$\frac{25}{3}ft/s$

Explanation:

Height of man= 6ft

Height of light=1 5ft

Let BC=x and CD=y

BD=x+y

Triangle ABD and ECD are similar

When two triangles are similar then the ratio of their corresponding sides are equal

$\frac{AB}{EC}=\frac{BD}{CD}$

$\frac{15}{6}=\frac{x+y}{y}$

$\frac{5}{2}=\frac{x+y}{y}$

$5y=2x+2y$

$5y-2y=2x$

$3y=2x$

Differentiate w.r.t t

$2\frac{dx}{dt}=3\frac{dy}{dt}$

We have $\frac{dx}{dt}=5ft/s$

Substitute the value then we get

$2\times 5=3\frac{dy}{dt}$

$\frac{dy}{dt}=\frac{2\times 5}{3}=10/3ft/s$

Rate at which the tip of shadow is moving= $\frac{dx}{dt}+\frac{dy}{dt}$

Rate at which the tip of shadow is moving= $5+\frac{10}{3}=\frac{15+10}{3}ft/s$

Rate at which the tip of shadow is moving= $\frac{25}{3}ft/s$

5 0

3 years ago

Einstein developed much of his understanding of relativity through the use of gedanken, or thought, experiments.

Zielflug [23.3K]

True. Thought experiments are what he called them, it’s like meditation

6 0

3 years ago

Read 2 more answers

A train started its journey at 9:00. Its average speed between

Vera_Pavlovna [14]

Answer:

Explanation:

In the four hours before 13:00 the train traveled 4(80) = 320 km.

It needs to travel another 4(320) = 1280 km in the next 21:00 - 13:00 = 8 hrs.

1280 / 8 = 160 km/hr

5 0

3 years ago

Laws that implemented the consumers' right to be informed forbid __________.

Reptile [31]

Laws that implemented the consumers' right to be informed forbid misleading advertising.

Answer is C.

4 0

3 years ago

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A sodium ion, Na+ , has a positive charge because it

goldenfox [79]

D. lost an electron

because they have free electron in the outermost shell which they will like to denote, in order to attain stable configuration

3 0

3 years ago