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2 years ago

What area of the earth contains semi-solid rock and lava

Physics

1 answer:

katrin2010 [14]2 years ago

6 0

Answer:

mantle

Explanation:

Below the crust lies a layer of very hot, almost solid rock called the mantle. Beneath the mantle lies the core. The outer core is a liquid mix of iron and nickel, but the inner core is solid metal. Sometimes, hot molten rock, called magma, bursts through Earth's surface in the form of a volcano.

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A soccer ball is released from rest at the top of a grassy incline. After 6.2 seconds, the ball travels 47 meters. One second la

alexandr1967 [171]

Answer:

(a) a = 2.44 m/s²

(b) s = 63.24 m

Explanation:

(a)

We will use the second equation of motion here:

$s = v_it+\frac{1}{2}at^2$

where,

s = distance covered = 47 m

vi = initial speed = 0 m/s

t = time taken = 6.2 s

a = acceleration = ?

Therefore,

$47\ m = (0\ m/s)(6.2\ s)+\frac{1}{2}a(6.2\ s)^2\\\\a = \frac{2(47\ m)}{(6.2\ s)^2}$

a = 2.44 m/s²

(b)

Now, we will again use the second equation of motion for the complete length of the inclined plane:

$s = v_it+\frac{1}{2}at^2$

where,

s = distance covered = ?

vi = initial speed = 0 m/s

t = time taken = 7.2 s

a = acceleration = 2.44 m/s²

Therefore,

$s = (0\ m/s)(6.2\ s)+\frac{1}{2}(2.44\ m/s^2)(7.2\ s)^2\\\\$

s = 63.24 m

6 0

3 years ago

A sound source producing 1.00 kHz waves moves toward a stationary listener at one-half the speed of sound.

SIZIF [17.4K]

Answer:

2000Hz and 1500Hz

Explanation:

Using

a) f = f0((c+vr)/(c+vs))

=>>> f0((c)/(c-0.5c))

=>>>1000/0.5 = 2000Hz

b) f = f0((c+vr)/(c+vs))

=>>>f0((c+0.5c)/(c))

=>>>>1000 x 1.5 = 1500Hz

5 0

3 years ago

To what potential should you charge a 0.900 μf capacitor to store 1.50 j of energy

adelina 88 [10]

The energy stored in a capacitor is given by
$U= \frac{1}{2} CV^2$
where C is the capacitance and V the voltage applied.
In our problem, $C=0.900 \mu F=0.9 \cdot 10^{-6} F$ , while the energy is $U=1.5 j$ . We can then solve the formula to find V:
$V= \sqrt{ \frac{2U}{C} }= \sqrt{ \frac{2\cdot 1.5 J}{0.9\cdot 10^{-6} F} }=1826 V$

6 0

3 years ago

A spring stretches 0.1 m when a 0.5 kg mass is hung from it. The spring is now oriented horizontally with the mass attached to o

monitta

Answer:

1.98 rad/s

Explanation:

Given that a spring stretches at a distance $x_0$ 0.1 m when a mass of 0.5 kg is attached to it.

The angular velocity $w = \sqrt {\frac{k}{m}} = \sqrt{\frac{g}{x_0}}$

$\omega = \sqrt{\frac{g}{x_0}}\\\\\omega = \sqrt{\frac{9.81}{0.1}}\\\\\omega = 9.9 \ rad/s$

If it is stretched 0.2 m from the equilibrium length; we have:

The maximum velocity v = 0.2 × 9.9

v = 1.98 rad/s

Therefore; the maximum velocity of the mass = 1.98 rad/s

5 0

3 years ago

Relate balanced and unbalanced forces to net forces

alina1380 [7]

Answer:If the forces on an object are balanced, the net force is zero.

Explanation:

If the forces are unbalanced forces, the effects don't cancel each other. Any time the forces acting on an object are unbalanced, the net force is not zero, and the motion of the object changes.

3 0

3 years ago