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3 years ago

The ______ of a star determines its temperature and luminosity.

Physics

1 answer:

Sauron [17]3 years ago

8 0

The mass of a star determines its temperature and luminosity

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18. A net force of 1.0N acts on a 4.0-kg object, initially at rest, for 4.0 seconds. What is the distance the object moves durin

hjlf

Acceleration = force/mass
1/4
s=ut+1/2at^2
0*4+1/2*1/4*4^2
1/2*1/4*16
1/2*4
=2

6 0

4 years ago

Read 2 more answers

400 gallons of pesticide is accidentally spilled into a lake and uniformly mixes with the water. The volume of the lake includin

svet-max [94.6K]

Answer:

t=27725.8minutes

Explanation:

To determinate use the law the change of volume in determinate time is derivate so:

$\frac{dV}{dt}=flowin-flowout$

The flow in is zero and the flow out is modeling with V as the volume out in the volume of the lake in the reason of change.

$\frac{dV}{dt}=0-(\frac{V}{10x10^{8}})*5000\\\frac{dV}{dt}=-5x10^{-5}*V \\dV*V=-5x10^{-5}*dt$

Integrate to get the volume function

$\int\limits{\frac{1}{V}}\, dv=\int\limits{-5x10^{-5} }\, dt\\ ln(V)=-5x10^{-5}*t\\ln*e(V)=C*e^{-5x10^{-5}*t}\\$

The find the constant C in the time t=0 the volume is knowing so:

$t=0s\\V=400\\V=C*e^{0}\\C=400$

$V=400*e^{-5x10^{-5}*t}$

The volume is 1 part per million so:

$\frac{V}{10x^{8}}=\frac{1}{10x^{6}}\\ V=100$

$V=400*e^{-5x10^{-5}*t}\\100=400*e^{-5x10^{-5}*t}\\\frac{100}{400}=e^{-5x10^{-5}*t}\\ln*\frac{1}{4}=ln*e^{-5x10^{-5}*t}\\-ln(4)=-5x10^{-5}*t\\ t=\frac{-ln(4)}{-5x10^{-5}}=27725.88\\t=27725.8minutes$

8 0

3 years ago

A student buys a plastic dart gun and tries to find the maximum horizontal range. The student shoots the gun straight up and it

ryzh [129]

Answer:

The value is $R_{max} = 33.54 \ m$

Explanation:

From the question we are told that

The total time of flight is $t = 3.7 \ s$

Generally from kinematic equation

$v = u - g * \frac{t}{2}$

So v is the velocity at maximum height and the value is v = 0 m/s

$0 = u - 9.8 * \frac{ 3.7}{2}$

=> $u = 18.13 \ m/s$

Here u is the initial velocity of the dart as it leaves that gun

Gnerally the horizontal range of the dart is mathematically represented as

$R = \frac{u ^2 sin 2\theta }{g}$

For maximum horizontal range the value of $\theta = 45^o$

$R_{max} = \frac{ 18.13 ^2 sin 2(45) }{9.8}$

=> $R_{max} = 33.54 \ m$

6 0

3 years ago

Why do we warm up when we wear warm clothes? Explain the hiccup from the point of view of physics.

bazaltina [42]

Well your body would be trapping heat when your cold your blood contricts to help hold in heat so it would help keep your body tempture up and keep heat from escaping

5 0

4 years ago

a supertanker traveling at 7.2 m/s decelerates to a halt in 12 min. Calculate the magnitud of its average decelaration in meters

Nataliya [291]

Explanation:

Acceleration is change in velocity over change in time.

a = Δv / Δt

a = (0 m/s − 7.2 m/s) / (12 min × 60 s/min)

a = -0.01 m/s²

8 0

3 years ago