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3 years ago

PLEASE HELP!! PHYSICS QUIZ!

Physics

2 answers:

diamong [38]3 years ago

5 0

Answer: True

Explanation: A projectile is launched at certain angle with the horizontal. Hence, its equation of motion can be described using vertical and horizontal components. Therefore, the statement is true.

Answer: False

Explanation:

The shape of the trajectory of a projectile is parabola. Hence, the given statement is false.

Answer: A) constant

Explanation: During the course of trajectory, the horizontal component of the velocity is constant. There is no external force acting in the horizontal direction. In the vertical direction, acceleration due to gravity acts which increases the vertical component of velocity. Hence, the correct option is A.

Dmitriy789 [7]3 years ago

4 0

1). Technically false if you're persnickety about your words. But this quiz wants you to say 'True'.

The projectile doesn't have vertical and horizontal components. But if the projectile is moving, then its displacement, velocity, and acceleration can have vertical and horizontal components.

2). This one's false. The shape of a projectile's trajectory is a parabola. (Unless the projectile is moving fast enough to be in a stable orbit. THEN its path is an ellipse.)

3). During the time the projectile is flying, the horizontal component of its velocity is constant IF THERE'S NO AIR RESISTANCE.

If there IS air resistance, then the horizontal component of velocity is decreasing.

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2 years ago

Rusting metal is an example of a _________ change. A) phase B) state C) chemical D) physical

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Answer:

C. Chemical Change

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2 years ago

Read 2 more answers

A professional racecar driver buys a car that can accelerate at 5.9 m/s2. The racer decides to race against another driver in a

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Answer:

(a) Time will be t = 3.56 sec

(b) Distance traveled by car when they are side by side is 37.38712 m

(b) Velocity of race car = 21.004 m/sec

velocity of stock car = 12.816 m/sec

Explanation:

We have given acceleration of the car $a_1=5.9m/sec^2$

Acceleration of the stock car $a_2=3.6m/sec^2$

When 1st car overtakes the second car then distance traveled by both the car will be same

(a) So $s_1=s_2$

As both car starts from rest so initial velocity of both car will be 0 m/sec

It is given that stock car leaves 1 sec before

So $\frac{1}{2}\times 5.9\times t^2=\frac{1}{2}\times (t+1)^2\times 3.6$

After solving t = 3.56 sec

(b) From second equation of motion $s=ut+\frac{1}{2}at^2=0\times 3.56+\frac{1}{2}\times 5.9\times 3.56^2=37.38712m$

So velocity of race car v = 0+5.9×3.56 = 21.004 m/sec

Velocity of stock car v = 0+ 3.6×3.56 = 12.816 m/sec

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3 years ago

Sometimes referred to as the law of inertia. An object at rest stays at rest and an object in motionstays in motion with the sam

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Answer:

Explanation:

Newtons first law states that if an object is at rest it will stay at rest only if an unbalanced force acts on it. As well as if an object is in motion it will stay in motion unless an unbalanced force acts on it.

Ps- The object will stay moving in the same speed and direction.

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2 years ago

Explain the difference between displacement and distance

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