If you are a victim of identity theft you are only responsible for paying back half of the debt. true or false

how long does it take sound to travel the distance between the two microphones? Given.:wave 1 of microphone 1 has T=2 sec and f=

Maksim231197 [3]

Answer:

0.00583 seconds

Explanation:

8 0

3 years ago

A 20.0-kg rock is sliding on a rough, horizontal surface at 8.00 m/s and eventually stops due to friction. The coefficient of ki

Neporo4naja [7]

Answer:

$a = -1.961\,\frac{m}{s^{2}}$ , $s = 16.318\,m$ , $t = 4.079\,s$

Explanation:

The equations of equilibrium for the rock are:

$\Sigma F_{x} = -\mu_{k}\cdot N = m \cdot a$

$\Sigma F_{y} = N - m\cdot g = 0$

After some algebraic handling, the following expression is found:

$-\mu_{k}\cdot m \cdot g = m \cdot a$

$-\mu_{k}\cdot g = a$

Deceleration experimented by the rock is:

$a = - (0.2)\cdot (9.807\,\frac{m}{s^{2}} )$

$a = -1.961\,\frac{m}{s^{2}}$

The distance travelled by the rock before stopping is:

$s = \frac{(0\,\frac{m}{s} )^{2}-(8\,\frac{m}{s} )^{2}}{2\cdot (-1.961\,\frac{m}{s^{2}} )}$

$s = 16.318\,m$

And the time is:

$t = \frac{0\,\frac{m}{s}-8\,\frac{m}{s}}{(-1.961\,\frac{m}{s^{2}} )}$

$t = 4.079\,s$

5 0

3 years ago

Read 2 more answers

A 0.537-kg basketball is dropped out of a window that is 5.88 m above the ground. The ball is caught by a person whose hands are

Monica [59]

Answer:

a) 20.54 J

b) 30.97 J

c) 10.43 J

d) -20.54 J

Explanation:

m = Mass

g = Acceleration due to gravity = 9.81 m/s²

h = Height

$W=mgh\\\Rightarrow W=0.537\times 9.81\times (5.88-1.98)\\\Rightarrow W=0.537\times 9.81\times 3.9\\\Rightarrow W=20.54\ J$

Work done by the ball's weight is 20.54 J

$W=mgh\\\Rightarrow W=0.537\times 9.81\times (5.88)\\\Rightarrow W=30.97\ J$

Gravitational potential energy of the basketball, relative to the ground, when it is released is 30.97 J

$W=mgh\\\Rightarrow W=0.537\times 9.81\times (1.98)\\\Rightarrow W=10.43\ J$

Gravitational potential energy of the basketball, relative to the ground, when it is released is 10.43 J

Change in gravitational potential energy

$\Delta U=10.43-30.97=-20.54\ J$

Change in gravitational potential energy is given by -20.54 J

4 0

4 years ago

Gamma rays and X–rays are similar because they both have

VARVARA [1.3K]

<span>High photon energy, high frequency, sub-optical wavelength</span>

5 0

3 years ago

If the sphere on the left is moved closer to the central cylinder and placed at a distance R/2 from the axis of rotation, what i

Alexxx [7]

Answer:

$\alpha= \frac{2rF}{3mR}$

Explanation:

The torque reqired to rotate the above masses rod system

$\tau = rF= I\alpha$ ...............(1)

Total moment of inertia of masses and rod is

$I=2m\left ( \frac{R}{2} \right )^2+mR^{2}$

= $\frac{3}{2} mR^{2}$

now Substitute I= $\frac{3}{2} mR^{2}$ in the (1) we get

$rF= \frac{3}{2}mR^{2}\alpha$

rearranging for alpha we get

$\alpha= \frac{2rF}{3mR}$

hence the acceleration is

$\alpha= \frac{2rF}{3mR}$

7 0

4 years ago