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1 year ago

Plsss help with this, will give brainliest!!!

Physics

1 answer:

Papessa [141]1 year ago

3 0

Answer:

True

False

True

metals, non-metal, high, lower

Explanation:

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Isla’s change in velocity is 30 m/s, and Hazel has the same change in velocity. Which best explains why they would have differen

lyudmila [28]

Acceleration = (change in velocity) / (time for the change) .

They may have had the same change in velocity, but if the changes
happened in different lengths of time, then their accelerations were
not the same.

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2 years ago

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A star near the visible edge of a galaxy travels in a uniform circular orbit. It is 41,200 ly (light-years) from the galactic ce

Ronch [10]

The total mass of the galaxy is 443.4 Solar mass

Orbital velocity ( $v$ ) = $\sqrt{\frac{MG}{R} }$

where M= weight of galaxy

G= gravitational constatnt = $6.674*10^-^1^1$ (given)

R = distance from centre = $41200$ Light years (given)= $4.12*9.5*10^1^6$ km (1 ly= $9.5*10^3$ billion km)

v= orbital velocity = $275$ $km/s$ (given)

∴ According to the formula

$(2.75*10^2)^2$ = $\frac{M*6.674*10^-^1^1}{4.12*9.5*10^1^6}$

⇒ $7.56*10^4*4.12*9.5*10^1^6=M*6.674*10^-^1^1$ (cross multiplying and expanding)

⇒ $29.59*10^2^1=M*6.674*10^-^1^1$

⇒ $\frac{29.59*10^2^1*10^1^1}{6.674}=M$

⇒ $4.434*10^3^2=M$

1 solar mass = $1.989*10^3^0 kg$

⇒ Mass in solar mass =443.4 Solar mass

⇒ M = 443.4 Solar mass

Learn more about Orbital velocity here :

brainly.com/question/22247460

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1 year ago

At the presentation ceremony, a championship bowler is presented a 1.60-kg trophy which he holds at arm's length, a distance of

nikdorinn [45]

Answer:

a)10.28 Nm

b)9.93 Nm

Explanation:

Let g = 9.81m/s2. First we can calculate the weight of the trophy

W = mg = 1.6 * 9.81 = 15.696 N

(a) The torque is product of force and its moment arm

T = WL = 15.696 * 0.655 = 10.28 Nm

(b) Suppose his arm makes an angle of 15 degree with respect to the horizontal line. We can still calculate the arm length, or the horizontal distance from the trophy to the champion:

$L_2 = Lcos(15^0) = 0.655cos(15^0) = 0.655*0.966 = 0.633 m$

Again, torque is product of force and its moment arm

$T_2 = WL_2 = 15.696 * 0.633 = 9.93 Nm$

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3 years ago

What is the approximate distance from the center of the milky way galaxy to the sun? select one:

ycow [4]

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2 years ago

What is the law of conservation of energy?

sdas [7]

Answer:

In physics and chemistry, the law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time. ... For instance, chemical energy is converted to kinetic energy when a stick of dynamite explodes.

Explanation:

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2 years ago

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Plsss help with this, will give brainliest!!! ​

Plsss help with this, will give brainliest!!!