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Marina CMI [18]

3 years ago

6

Some gamma ray bursts are hypothesized to come from mergers of neutron stars or black holes. if this hypothesis is correct, what

else should we in principle be able to detect from such mergers?

1 answer:

Umnica [9.8K]3 years ago

6 0

We should see (and have now detected with LIGO) gravitational waves

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An elevator motor in a high-rise building can do 3500 kJ of work in 5 min. Find the power developed by the motor. Explain if you

Ilya [14]

Answer:

P = 11666.6 W

Explanation:

Given that,

Work done by the motor, W = 3500 kJ

Time, t = 5 min = 300 s

We need to find the power developed by the motor. Power developed is given by :

$P=\dfrac{E}{t}\\\\P=\dfrac{3500\times 10^3}{300}\\\\P=11666.7\ W$

So, the required power is 11666.6 W.

4 0

3 years ago

A 0.5 kg block slides down a frictionless semicircular track from a height, h, and collides with a second 1.5 kg block at the bo

Ede4ka [16]

Answer:

$h' = 0.062\cdot h$

Explanation:

The speed of the 0.5 kg block just before the collision is found by the Principle of Energy Conservation:

$U_{g} = K$

$m\cdot g \cdot h = \frac{1}{2}\cdot m \cdot v^{2}$

$v = \sqrt{2\cdot g \cdot h}$

$v = \sqrt{2\cdot (9.807\,\frac{m}{s^{2}} )\cdot h}$

$v \approx 4.429\cdot \sqrt{h}$

Knowing that collision is inelastic, the speed just after the collision is determined with the help of the Principle of Momentum Conservation:

$(0.5\,kg) \cdot (4.429\cdot \sqrt{h}) = (2\,kg)\cdot v$

$v = 1.107\cdot \sqrt{h}$

Lastly, the height reached by the two blocks is:

$K = U_{g}$

$\frac{1}{2}\cdot m \cdot v^{2} = m\cdot g \cdot h'$

$h' = \frac{v^{2}}{2\cdot g}$

$h' = \frac{(1.107\cdot \sqrt{h})^{2}}{2\cdot \left(9.807\,\frac{m}{s^{2}} \right)}$

$h' = 0.062\cdot h$

3 0

3 years ago

Can u plzz help meee

KATRIN_1 [288]

The answer is
h: sB and Sb
hd : sb
hr : SB

4 0

3 years ago

Read 2 more answers

A car traveling at 60 mph has how much more energy than a car going at 20 mph? How many times does the kinetic energy of a car i

irinina [24]

K.E. increases by 9 times

Explanation:

The kinetic energy of a car is given by:

$KE=\frac{1}{2}mv^2$

where

m is the mass of the car

v is its speed

From this definition, we see that the kinetic energy depends on the square of the velocity. Assuming that both cars have same mass, m, the kinetic energy of the first car is:

$K_1 = \frac{1}{2}m(60)^2$

while the kinetic energy of the second car is

$K_2 = \frac{1}{2}m(20)^2$

if we calculate the ratio, we get

$\frac{K_1}{K_2}=\frac{(60)^2}{(20)^2}=3^2 =9$

5 0

4 years ago

Read 2 more answers

What is the atomic number of potassium?

vovikov84 [41]

Potassium is the 19th element so it is B

6 0

4 years ago