All categories

3 years ago

Over the past 150 years, what has happened to the amount of forest cover in Minnesota?

Physics

1 answer:

Airida [17]3 years ago

4 0

I think D. None of the above

I think that it

You might be interested in

A bicycle generator rotates at 154 rads/s, producing an 16.5 V peak emf. It has a 1.00 by 3.00 cm rectangular coil in a 0.68 T f

WITCHER [35]

Answer:

525.2

Explanation:

w = 154 rad/s, e0 = 16.5 V, A = 1 x 3 = 3 cm^2 = 3 x 10^-4 m^2, B = 0.68 T

Let the number of turns be N.

By use of law of electromagnetic induction

e0 = N B A w

16.5 = N x 0.68 x 3 x 10^-4 x 154

N = 525.2

7 0

3 years ago

Read 2 more answers

A 0.032-kg bullet is fired vertically at 230 m/s into a 0.15-kg baseball that is initially at rest. How high does the combined b

gogolik [260]

Answer:

$heigth=83.44m$

Explanation:

Given data

Baseball mass m₁=0.15 kg

initial speed v₁=0

Bullet mass m₂=0.032 kg

final speed v₂=230 m/s

To find

height h=?

Solution

From conservation of momentum we know that

$m_{1}v_{1}+m_{2}v_{2}=(m_{1}+m_{2})v\\ (0.032kg)(230m/s)+(0.15kg)(0m/s)=(0.15kg+0.032kg)v\\7.36+0=0.182v\\v=7.36/0.182\\v=40.44m/s$

Now from the conservation of mechanical energy

$P.E=K.E\\mgh=(1/2)mv^{2}\\ gh=(1/2)v^{2}\\ (9.8m/s^{2} )h=(1/2)(40.44m/s)^{2}\\ (9.8m/s^{2} )h=(817.7m^{2} /s^{2} )\\h=(817.7m^{2} /s^{2} )/9.8m/s^{2}\\ heigth=83.44m$

5 0

3 years ago

The frequency of a sound wave was measured to be 351 Hz. If you know that the speed of sound in air was 343 m/s, then determine

netineya [11]

Answer:

wavelength of the sound wave will be 0.977 m

Explanation:

We have given frequency of the sound wave f = 351 Hz

Speed of the sound wave v = 343 m/sec

We have to find the wavelength of the sound wave

We know that velocity of the sound wave is given by $v=\lambda f$

So wavelength of the sound wave $\lambda =\frac{v}{f}=\frac{343}{351}=0.977m$

So wavelength of the sound wave will be 0.977 m

4 0

3 years ago

Light wands are small tubes that can be used to give off light without electricity or fire.

miv72 [106K]

<span>c.the chemical energy of the fluids inside the wand</span>

4 0

3 years ago

Read 2 more answers

A 9.12 microFarad capacitor is measured to have a reactance of 268.0 Ohm. At what frequency (in Hz) is it being driven?

Katen [24]

Answer:

65.14 Hz

Explanation:

We have given the capacitance $C=9.12\mu F=9.12\times 106{-6}F$

And the capacitive reluctance = 268 ohm

The capacitive reluctance of a capacitive circuit is given by

$X_C=\frac{1}{\omega C}$

$X_C=\frac{1}{2\pi f C}$

$268=\frac{1}{2\pi f \times 9.12\times 10^{-6}}$

$f=\frac{1}{2\times 3.14\times 268\times 9.12\times 10^{-6}}=65.14Hz$

3 0

3 years ago