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3 years ago

In which direction does Earth’s gravitational force act?

1 answer:

6 0

B downward
Earth's gravitational force acts in what direction? Earth's gravity acts downward toward the center of Earth. Gravity causes objects to accelerate downward, whereas air resistance acts in the direction opposite to the motion and reduces acceleration.

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What is the relationship between instantaneous speed and instantaneous velocity?

Natalija [7]

Answer:

Instantaneous speed is a scalar quantity.

Instantaneous velocity is a vector quantity.

Consider an object moving at a constant speed in a circle.

There is no change in speed as the object continues in a circular motion.

The acceleration however is

a = v^2 / r because a vector representing the object is continually changing direction and the change in velocity is not zero as time increases.

4 0

2 years ago

Alan hits a hockey pick of mass 0.3 kg across a hockey rink with a velocity of 18 m/s to the east.

Talja [164]

PART a)

Momentum is defined as product of mass and velocity

so here initial momentum is

$P = mv$

given that

m = 0.3 kg

v = 18 m/s

$P = 0.3(18) = 5.4 kg m/s$

towards East

Part b)

Since puck was initially at rest so here initial momentum must be ZERO

so here to find the force we can use

$F = \frac{\Delta P}{\Delta t}$

so here we have

time interval = 0.25 s

now from above equation

$F = \frac{5.4 - 0}{0.25}$

$F = 21.6 N$

Part c)

Due to friction the puck lose its speed by 5 m/s

final speed = 18 - 5 = 13 m/s

mass = 0.3 kg

final momentum = (0.3)(13) = 3.9 kg m/s

now the impulse due to friction force is given as

$Impulse = P_f - P_i$

$impulse = 3.9 - 5.4 = -1.5 kg m/s$

Part d)

initial momentum of block will be ZERO as it is placed at rest

Initial momentum of the puck is given as

$P = mv = (0.3)(13) = 3.9 kg m/s$

so total momentum before collision is given as

$P = 3.9 + 0 = 3.9 kg m/s$

Part e)

since the system is isolated and there is no external force on it

So here momentum will remain conserved

so here we have

$P_i = P_f$

$3.9 = (m_1 + m_2) v$

$3.9 = (0.3 + 1.2)v$

$v = 2.6 m/s$

so final combined speed will be 2.6 m/s

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3 years ago

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A _______ property of gasoline is that it will _______ in air.

Misha Larkins [42]

A chemical property of gasoline is that it will burn in air. Gasoline is a substance that is used to power automobiles. Gasoline will oxidize in air which means that it reacts with oxygen in air. Hope this answers the question. Have a nice day.

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4 years ago

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In which direction is the magnetic force acting in the charge?

Luda [366]

Answer:

"Right Hand

Right Hand Rule: Magnetic fields exert forces on moving charges. This force is one of the most basic known. The direction of the magnetic force on a moving charge is perpendicular to the plane formed by v and B and follows right hand rule–1 (RHR-1) "

Explanation:

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