3 years ago

Which statement is correct? (2 points) Select one:

1 answer:

7 0

<span>The correct answer is B - Light can travel in a vacuum, and its speed is constant if the source is moving or stationary.</span>

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Newton's law of cooling states that the temperature of an object changes at a rate proportional to the difference between its te

QveST [7]

Answer:

Please see attachment

Explanation:

Please see attachment

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3 years ago

A car has a mass of 1,200 kg. What is its acceleration when the engine exerts a force of 600 N? (Formula: F=ma)

Rasek [7]

Answer:

Option (a)

Explanation:

Given that,

Mass of a car, m = 1200 kg

Force exerted by the engine, F = 600 N

Noe force,F = ma

a is the acceleration of the engine

$a=\dfrac{F}{m}\\\\a=\dfrac{600\ N}{1200\ kg}\\\\a=0.5\ m/s^2$

So, the acceleration of the car is 0.5 m/s².

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3 years ago

A grindstone of mass 12 kg and radius 0.3 m is initially rotating freely at 48 rad/sec. An axe is brought into contact with the

lesya [120]

Answer:

$I = 0.54\,kg\cdot m^{2}$

Explanation:

1) The moment of inertia of the grindstone is:

$I = \frac{1}{2}\cdot m \cdot r^{2}$

$I = \frac{1}{2}\cdot (12\,kg)\cdot (0.3\,m)^{2}$

$I = 0.54\,kg\cdot m^{2}$

4 0

4 years ago

Read 2 more answers

Just this last one!!

Pepsi [2]

Answer:

$47 \ \frac{m}{s}$

Explanation:

s = displacement (m)

u = initial velocity $(\frac{m}{s})$

v = final velocity $(\frac{m}{s})$

a = acceleration $(\frac{m}{s^{2} })$

t = time (s)

s = 235

a = -4.7

v = 0

v² = u² + 2as

(0)² = u² + 2(-4.7)(235)

u² - 2209 = 0

u² = 2209

u = 47

4 0

2 years ago

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A juggler throws a bowling pin straight up with an initial speed of 9.20m/s. How much time elapses before the pin reaches the ju

timama [110]

$v=v(0)+at$

$9.20=0+(9.81*t)$ $|$ 9.81 because the fall is due to gravity.

$t= \frac{9.20}{9.81}$

$t=0.94seconds$

8 0

3 years ago

Read 2 more answers