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3 years ago

HELP ASAP

Physics

1 answer:

svlad2 [7]3 years ago

3 0

Answer:

1)a- mass never changes as you move from the earth

2)actually am not sure I haven't been taught that too

3)b

4)a-it doesn't depend only on mass but also weight

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Un avión de rescate en Alaska deja caer un paquete de provisiones a un grupo de exploradores extraviados. Si el avión viaja hori

posledela

Answer:

180.4 m

Explanation:

The package in relation to the point where it was released falls a certain distance that is calculated by applying the horizontal motion formulas , as the horizontal speed of the plane and the height above the ground are known, the time that It takes the package to reach its destination and then the horizontal distance (x) is calculated from where it was dropped, as follows:

$V_{ox}=v_x = 40 \ m/s$

h = 100 m

x =?

Height formula h:

$h=g \times \frac{t^2}{2}$

Time t is cleared:

$t = \sqrt{\frac{2h}{g}}$

$t = \sqrt{\frac{2 \times 100}{9.8}}$

t = 4.51 sec

Horizontal distance formula x:

$x=V_x \times t$

x = 40 m / sec x 4.51 sec

x = 180.4 m

4 0

3 years ago

If two objects A and B have the same kinetic energy but A has three times the momentum of B, what is the ratio of their inertias

Thepotemich [5.8K]

Answer:

$\frac{inertia_B}{inertia_A}=9$

Explanation:

First of all, let's remind that:

- The kinetic energy of an object is given by $K=\frac{1}{2}mv^2$ , where m is the mass and v is the speed

- The momentum of an object is given by $p=mv$

- The inertia of an object is proportional to its mass, so we can write $I=km$ , where k just indicates a constant of proportionality

In this problem, we have:

- $K_A = K_B$ (the two objects have same kinetic energy)

- $p_A = 3 p_B$ (A has three times the momentum of B)

Re-writing both equation we have:

$\frac{1}{2}m_A v_A^2 = \frac{1}{2}m_B v_B^2\\m_A v_A = 3 m_B v_B$

If we divide first equation by second one we get

$v_A = 3 v_B$

And if we substitute it into the first equation we get

$m_A (3 v_B)^2 = m_B v_B^2\\9 m_A v_B^2 = m_B v_B^2\\m_B = 9 m_A$

So, B has 9 times more mass than A, and so B has 9 times more inertia than A, and their ratio is:

$\frac{I_B}{I_A}=\frac{km_B}{km_A}=\frac{9m_A}{m_A}=9$

7 0

3 years ago

If a 54 kg sprinter can accelerate from a standing start to a speed of 10 m/s in 3 s, what average power is generated?

lora16 [44]

Answer:

Power, P = 600 watts

Explanation:

It is given that,

Mass of sprinter, m = 54 kg

Speed, v = 10 m/s

Time taken, t = 3 s

We need to find the average power generated. The work done divided by time taken is called power generated by the sprinter i.e.

$P=\dfrac{W}{t}$

Work done is equal to the change in kinetic energy of the sprinter.

$P=\dfrac{\dfrac{1}{2}mv^2}{t}$

$P=\dfrac{\dfrac{1}{2}\times 54\ kg\times (10\ m/s)^2}{3\ s}$

P = 900 watts

So, the average power generated by the sprinter is 900 watts. Hence, this is the required solution.

3 0

3 years ago

Which of the following statements is an explanation? A. Aggressive chimpanzees should be monitored during meal times or fed sepa

ratelena [41]

Answer:

Explanation:

My best guess would be C as it's the only answer that gives a reason behind the statement.

5 0

3 years ago

Read 2 more answers

An iron sphere of radius 0.18m has mass 190 kg. Calculate the density of the iron

Slav-nsk [51]

radius=r=0.18m

Volume:-

$\\ \sf\rightarrowtail \dfrac{4}{3}\pi r^3$

$\\ \sf\rightarrowtail \dfrac{4}{3}\pi (0.18)^3$

$\\ \sf\rightarrowtail \dfrac{4}{3}\pi (0.005832)$

$\\ \sf\rightarrowtail 0.024m^3$

Mass=190kg

Density:-

$\\ \sf\rightarrowtail \dfrac{Mass}{Volume}$

$\\ \sf\rightarrowtail \dfrac{190}{0.024}$

$\\ \sf\rightarrowtail 7916.67kg/m^3$

8 0

2 years ago