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3 years ago

12

Danny lowers the sails on his boat. He paddles upstream at 19 km/hr. The current is still running downstream at 15 km/hr. What i

s the actual velocity of the boat?

1 answer:

Molodets [167]3 years ago

3 0

Answer:

4 km/hr

Explanation:

The computation of the actual velocity is shown below:

Because the path of its paddles is opposed to the current direction, the real velocity can be determined by deducting the current velocity to its velocity while paddling

So, the actual velocity is

= Upstream - downstream

= 19 km/hr - 15 km/hr

= 4 km/hr

As we can see it is in positive, so it is an upstream direction

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When a 100-Ω resistor is connected across the terminals of a battery of emf ε and internal resistance r, the battery delivers 0.

gladu [14]

Answer:

The emf and internal resistance of the battery are 9 volt and 2.04 Ω

Explanation:

Given that,

First resistor $R = 100\ \Omega$

Power $P = 0.794\ W$

Second resistor $R=200\ \Omega$

Power $P=0.401\ W$

We need to calculate the emf and internal resistance

Using formula of emf

$P=\dfrac{e^2}{R+r}$

For first resistor

$0.794=\dfrac{e^2}{100+r}$ ....(I)

For second resistor

$0.401=\dfrac{e^2}{200+r}$ .....(II)

From equation (I) and (II)

$\dfrac{795}{401}=\dfrac{200+r}{100+r}$

Using component of dividend rule

$\dfrac{393}{401}=\dfrac{100}{100+r}$

$r =2.04\ \Omega$

Now, Put the value of internal resistance in equation (I)

$0.794=\dfrac{e^2}{100+2.04}$

$e^2=0.794(100+2.04)$

$e=\sqrt{0.794(100+2.04)}$

$e=9\ volt$

Hence, The emf and internal resistance of the battery are 9 volt and 2.04 Ω

5 0

3 years ago

Hybrid seeds are deliberately crossbred for particular traits, such as growth pattern or disease resistance. They have been hand

Lena [83]

Answer:

Unlike heirloom seeds, if one saves a hybrid seed, one will not get the same plant again.

Explanation:

The statement that can be removed without affecting the reliability of overall paragraph is, "unlike heirloom seeds, if one saves a hybrid seed, one will not get the same plant again". <em>This is because even if we remove this line, the paragraph still looks completely understandable, reliable and in a flow.</em>

If we talk about hybrid plants, we know that they are produced through cross pollination of the crops with desired traits. Although they are sterile and cannot produce offspring, however the plants which are raised from these seeds are edible and quite healthy. This is why these plants have better yield and a better resistance against environmental constraints like diseases and stresses. After the production, hybrid seeds are stored and they are able to produce plants of similar types.

Hope it helps!

7 0

3 years ago

A juggler throws a ball straight up into the air. The ball remains in the air for a time (t) before it lands back in the juggler

natka813 [3]

Answer:

$9.8 m/s^2$ , downward

Explanation:

There is only one force acting on the ball during its motion: the force of gravity, which is given by

$F=mg$

where

m is the mass of the ball

$g=9.8 m/s^2$ is the acceleration of gravity (downward)

According to Newton's second law,

$F=ma$

where F is the net force on the object and a is its acceleration. Rearranging for a,

$a=\frac{F}{m}$

As we said, the only force acting on the ball is gravity, so F = mg and the acceleration of the ball is:

$a=\frac{mg}{m}=g$

Therefore, the ball has a constant acceleration of $9.8 m/s^2$ downward for the entire motion.

5 0

3 years ago

HURRY! PLEASE HELP!!!!<br><br><br> 3. What methods are you using to test this (or each) hypothesis?

Pie

Answer:

How to Test Hypotheses

State the hypotheses. Every hypothesis test requires the analyst to state a null hypothesis and an alternative hypothesis. ...

Formulate an analysis plan. The analysis plan describes how to use sample data to accept or reject the null hypothesis. ...

Analyze sample data. ...

Interpret the results.

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3 years ago

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Dominik [7]

Answer:Esotericism

Explanation:

it’s something that’s in intentional out of body experience

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3 years ago

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