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3 years ago

This may be chemistry or physics but I need help regardless

Physics

1 answer:

storchak [24]3 years ago

6 0

Answer:

C.I dont know but that is my answer

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What is the period of a sound wave with a frequency of 20Hz?

swat32

Answer is 0.05

Explanation

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3 years ago

Calculate the power developed in a 6.0o resistor with a potential drop of 12 volts.

hjlf

Answer:24watts

Explanation:

Power=(volt)^2/r

Power=12^2/6

Power=144/6

Power=24watts

7 0

4 years ago

Read 2 more answers

Kathy tests her new sports car by racing with Stan, an experienced racer. Both start from rest, but Kathy leaves the starting li

Alekssandra [29.7K]

Answer:

time at which Kathy overtakes Stan is 6.70 sec

Explanation:

given data

time = 1 sec

acceleration= 3.4 m/s²

acceleration = 4.49 m/s²

to find out

the time at which Kathy overtakes Stan

solution

we consider here travel time for kathy = t1

and travel time for stan is = t2

and we know initial velocity = 0

t1 = 1 + t2

and distance travel equation by kinematic is

d1 = ut + $\frac{1}{2}$ at²

d1 = 0+ $\frac{1}{2}$ 4.49 (t2)² ................1

and

d2 = 0 + $\frac{1}{2}$ 3.4 (1+t2)² ..................2

and when overtake distance same so from equation 1 and 2

$\frac{1}{2}$ 4.49 (t2)² = $\frac{1}{2}$ 3.4 (1+t2)²

t2 = 6.703828 sec

so time at which Kathy overtakes Stan is 6.70 sec

3 0

3 years ago

What is the largest suspected environmental problem associated with the burning of fossil fuels?

Otrada [13]

The answer is global warming.

7 0

3 years ago

Read 2 more answers

An effective treatment for some cancerous tumors involves irradiation with "fast" neutrons. The neutrons from one treatment sour

KATRIN_1 [288]

Answer:

$5.07\cdot 10^{-14} m$

Explanation:

The velocity of the neutrons is

$v=3.13\cdot 10^7 m/s$

The mass of a neutron is

$m=1.66\cdot 10^{-27} kg$

So their momentum is

$p=mv=(1.66\cdot 10^{-27})(3.13\cdot 10^7)=5.20\cdot 10^{-20}kg m/s$

The relative uncertainty on the velocity is 2 %. Assuming that the mass of the neutron is known with negligible uncertainty, then the relative uncertainty on the momentum of the neutron is equal to the relative uncertainty on the velocity, so 2%. Therefore, the absolute uncertainty on the momentum is

$\sigma_p = 0.02 p =0.02(5.20\cdot 10^{-20})=1.04\cdot 10^{-21} kg m/s$

Heisenber's uncertainty principle states that

$\sigma_x \sigma_p \geq \frac{h}{4\pi}$

where

$\sigma_x$ is the uncertainty on the position

h is the Planck constant

Solving for $\sigma_x$ , we find the minimum uncertainty on the position:

$\sigma_x \geq \frac{h}{4\pi \sigma_p}=\frac{6.63\cdot 10^{-34}}{4\pi(1.04\cdot 10^{-21})}=5.07\cdot 10^{-14} m$

7 0

3 years ago