A negatively charged object has?

From the gravitational law, calculate the weight W (gravitational force with respect to the earth) of a 70 kg spacecraft traveli

Firlakuza [10]

Answer:

The value in Newton is $W = 631.92 \ N$

The value in pounds is $W = 142 \ lb$

Explanation:

From the question we are told that

The mass of the spacecraft is $m = 70 \ kg$

The distance above the earth is $d = 275 \ km = 275000 \ m$

Generally the gravitational force with respect to the earth is mathematically represented as

$W = \frac{G * m * m_e}{ (d + r_e)^2}$

Here $m_e$ is the mass of earth with value $m_e = 5.978 *10^{24} \ kg$

$r_e$ is the radius of the earth with value $r_e = 6371 \ km = 6371000 \ m$

G is the gravitational constant with value $G = 6.67 *10^{-11} \ m^3/ kg\cdot s^2$

So

$W = \frac{ 6.67 *10^{-11} * 70 * 5.978 *10^{24}}{ (275000 + 6371000)^2}$

$W = 631.92 \ N$

Converting to pounds

$W = \frac{631.92 }{4.45}$

$W = 142 \ lb$

7 0

2 years ago

An unwary football player collides with a padded goalpost while running at a velocity of 9.50 m/s and comes to a full stop after

Amanda [17]

Answer:

(a) The collision lasts for 0.053 s.

(b) The deceleration is 180.5 m/s².

Explanation:

Given:

Initial velocity of the player (u) = 9.50 m/s

Final velocity of the player (v) = 0 m/s (Comes to a stop)

Displacement of the player (S) = 0.250 m

We know that, using equation of motion relating displacement (S), acceleration (a), initial velocity (u) and final velocity (v), we have:

$v^2=u^2+2aS$

Expressing in terms of 'a', we get:

$a=\frac{v^2-u^2}{2S}$

Plug in the given values and solve for 'a'. This gives,

$a=\frac{0-9.50^2}{2\times 0.250}\\\\a=\frac{-90.25}{0.5}=-180.5\ m/s^2$

Therefore, the acceleration of the player is -180.5 m/s². So, the deceleration is 180.5 m/s².

Now, using the first equation of motion, we have:

$v=u+at\\\\t=\frac{v-u}{a}$

Plug in the given values and solve for 't'. This gives,

$t=\frac{0-9.5}{-180.5}\\\\t=0.053\ s$

Therefore, the the collision will last for 0.053 s.

(a) The collision lasts for 0.053 s.

(b) The deceleration is 180.5 m/s².

8 0

3 years ago

The grains found in igneous rock:

kondor19780726 [428]

Option c. are large

Igneous rocks are crystalline solids which are formed after the magma cools. The sizes vary greatly depending on how quickly the magma cooled. The slower the cooling, the larger the crystals in the final rock. They cooled at depth in the crust where they were insulated by layers of rock and sediment.

3 0

3 years ago

Read 2 more answers

People who drink coffee are more likely to develop cancer

krok68 [10]

Answer:

The answer is False

8 0

2 years ago

Read 2 more answers

A small charged sphere is attached to a thread and placed in an electric field. The other end of the thread is anchored so that

VMariaS [17]