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evablogger [386]

3 years ago

6

Which statement best explains acceleration?

2 answers:

laila [671]3 years ago

8 0

Acceleration is just how fast velocity is changing in a certain time. Simply subtract the final velocity from initial velocity, then take that number and divide that by the change in time. If that sounds familiar, it's because it's the same formula you use to find the slope of a line. If you've done calculus, it's finding the secant line, which means you've found the average acceleration using the (change in v)/(change in t). If you need the instantaneous acceleration, you need to take the derivative of your function at a certain time(also calculus.) ignore the last two sentences if you haven't taken calc1

Alexxx [7]3 years ago

5 0

Acceleration is the ratio of a change in velocity to the time over which the change happend

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Which substance has a melting point greater than room temperature?

blagie [28]

Answer:

I think the answer is D.)

Explanation:

If it means something needs to melt into liquid i would have gone with B.) or C.) but since it doesn't specifiy. I thought D.) since all you have to do is heat it and it melts or boils.

4 0

3 years ago

A 10-cm-long wire is pulled along a u-shaped conducting rail in a perpendicular magnetic field. the total resistance of the wire

Debora [2.8K]

In the above case we can say that power given by external agent to pull the rod must be equal to the power dissipated in the form of heat due to magnetic induction.

Part a)

when we pull the rod with constant speed then power required will be product of force and velocity

here we will have

$P = F.v$

P = 4 W

v = 4 m/s

now we will have

$4 = F*4$

$F = 1N$

So external force required will be 1 N

PART B)

now in order to find magnetic field strength we can say

$P = \frac{v^2B^2L^2}{R}$

here we know that induced EMF in the wire is E = vBL

so power due to induced magnetic field is given by

$P = \frac{E^2}{R}$

$4 = \frac{4^2*B^2*0.10^2}{0.20}$

by solving above equation we will have

$B = 2.24 T$

5 0

3 years ago

An airplane of mass 39,043.01 flies horizontally at an altitude of 9.2 km with a constant speed of 335 m/s relative to Earth. Wh

Likurg_2 [28]

Answer:

1.2 x 10¹¹ kgm²/s

Explanation:

m = mass of the airplane = 39043.01

r = altitude of the airplane = 9.2 km = 9.2 x 1000 m = 9200 m

v = speed of airplane = 335 m/s

L = Angular momentum of airplane

Angular momentum of airplane is given as

L = m v r

Inserting the values

L = (39043.01 ) (335) (9200)

L = (39043.01 ) (3082000)

L = 1.2 x 10¹¹ kgm²/s

8 0

3 years ago

The diagram below shows a wave with its wavelength indicated in red.

Shtirlitz [24]

Answer:

answer is D.it will decrease

8 0

3 years ago

Read 2 more answers

The standard emf for the cell using the overall cell reaction below is +2.20 V: 2Al(s) + 3I2 (s) → 2Al3+ (aq) + 6I− (aq) The emf

Triss [41]

Answer: +2.10V

Explanation:

$2Al(s)+3I_2(s)\rightarrow 2Al^{3+}(aq)+6I^-(aq)$

Using Nernst equation :

$E_{cell}=E^o_{cell}-\frac{0.059}{n}\log K$

$E_{cell}=E^o_{cell}-\frac{0.059}{n}\log [Al^{3+}]^2\times [I^-]^6$

where,

$E^o_{cell}$ = standard emf for the cell = +2.20 V

n = number of electrons in oxidation-reduction reaction = 6

$E_{cell}$ = emf of the cell = ?

$[Al^{3+}]$ = concentration = $5.0\times 10^{-3}M$

$[I}^{-}]$ = concentration = $0.10M$

Now put all the given values in the above equation, we get:

$E_{cell}=+2.20-\frac{0.059}{6}\log [5.0\times 10^{-3}]^2\times [0.10]^6$

$E_{cell}=2.10V$

The standard emf for the cell using the overall cell reaction below is +2.10 V

5 0

3 years ago