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3 years ago

Can someone tell me how to solve this?

Physics

1 answer:

finlep [7]3 years ago

8 0

According to Newton‘s second law of motion the acceleration of an object equals the net force acting on it divided by its mass or a=Fm.

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If there were no air resistance, a penny dropped from the top of a skyscraper would reach the ground 9.3 s later. To the nearest

Strike441 [17]

Answer:

To the nearest integer, the penny's speed in m/s be right as it reaches the ground if it was dropped from rest = 91 m/s

Explanation:

We have equation of motion

S = ut + 0.5at²

Here u = 0, a = g and t = 9.3 s

We have equation of motion v = u +at

Substituting

v = u +at

v = 0 + 9.8 x 9.3 = 91.14 m/s

To the nearest integer, the penny's speed in m/s be right as it reaches the ground if it was dropped from rest = 91 m/s

7 0

3 years ago

Explain why 15yr old need more calcium than adults

Tom [10]

Answer:

When adolescents get enough calcium during the teen years, they can start out their adult lives with the strong bones and significantly reduce their risk for fractures as an adult. Inadequate calcium intake during adolescence and young adulthood puts individuals at risk for developing osteoporosis later in life.

8 0

3 years ago

Read 2 more answers

During normal beating, the heart creates a maximum 4.00-mV potential across 0.300 m of a person’s chest, creating a 1.00-Hz elec

erik [133]

Answer:

(a). The maximum electric field strength is 0.0133 V/m.

(b). The maximum magnetic field strength in the electromagnetic wave is $4.433\times10^{-11}\ T$

(c). The wavelength of the electromagnetic wave is $3\times10^{8}\ m$

Explanation:

Given that,

Maximum potential = 4.00 mV

Distance = 0.300\ m

Frequency = 1.00 Hz

(a). We need to calculate the maximum electric field strength

Using formula of the potential difference

$\Delta V=Ed$

$E=\dfrac{\Delta V}{d}$

$E=\dfrac{4.00\times10^{-3}}{0.300}$

$E=0.0133\ V/m$

(b). We need to calculate the maximum magnetic field strength in the electromagnetic wave

Using formula of the maximum magnetic field strength in the electromagnetic wave

$B=\dfrac{E}{c}$

Put the value into the formula

$B=\dfrac{0.0133}{3\times10^{8}}$

$B=4.433\times10^{-11}\ T$

(c). We need to calculate the wavelength of the electromagnetic wave

Using formula of wavelength

$c=f\lambda$

$\lambda=\dfrac{c}{f}$

Put the value into the formula

$\lambda=\dfrac{3\times10^{8}}{1.00}$

$\lambda=3\times10^{8}\ m$

Hence, (a). The maximum electric field strength is 0.0133 V/m.

(b). The maximum magnetic field strength in the electromagnetic wave is $4.433\times10^{-11}\ T$

(c). The wavelength of the electromagnetic wave is $3\times10^{8}\ m$

4 0

3 years ago

On a horizontal, linear track lies a cart that has a fan attached to it. The mass of the cart plus fan is 364 g. The cart is pos

mamaluj [8]

Answer:

6.62s

Explanation:

Metric unit conversion:

364 g = 0.364 kg

789 g = 0.789 kg

Starting from rest, the cart takes 4.49 s to travel a distance of 1.43 m. We can use the following equation of motion to calculate the constant acceleration

$s = a_1t_1^2/2$

$a_1 = \frac{2s}{t_1^2} = \frac{2*1.43}{4.49^2} = 0.142 m/s^2$

Using Newton's 2nd law, we can calculate the force generated by the fan to push the 0.364 kg cart forward

$F = a_1m_1 = 0.142*0.364 = 0.052 N$

Now that more mass is added, the new acceleration of the 0.789 kg cart is

$a_2 = F/m_2 = 0.052 / 0.789 = 0.065 m/s^2$

We can reuse the same equation of motion to calculate the time it takes to travel 1.43 m from rest

$s = a_2t_2^2/2$

$t_2^2 = 2s/a_2 = 2*1.43/0.065 = 43.7$

$t_2 = \sqrt{43.7} = 6.62s$

6 0

4 years ago

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Who was the powerful and ruthless leader of the soviet union from 1929-1953 who also ordered the great purge in which he had his

Soloha48 [4]

Answer:

The correct answer is Joseph Stalin.

Explanation:

Joseph Vissarionovich Stalin was a Soviet politician who led the soviet union from 1929 - 1953. Stalin self declared himself as the dictator by 1930s. He was the person behind the Great Purge or "Great Terror" in which around a million were imprisoned and some 750,000 were executed. This campaign was led just to execute all those who were a threat to his party.

6 0

3 years ago

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