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3 years ago

If an object has zero acceleration, does that mean it has zero velocity?

2 answers:

7 0

Not really as acceleration is rate of change of velocity therefore zero acceleration would Mean that the velocity is constant

AveGali [126]3 years ago

4 0

Of course ! Anything moving in a straight line at a constant speed has zero acceleration. Acceleration is a CHANGE in the direction or speed of motion.

You might be interested in

A ball is fired from a cannon at point 1 and follows the trajectory shown in the figure below. Air

AveGali [126]

In trajectory, acceleration vector is not the same with the velocity vector but it depends on the change in velocity. The acceleration path is perpendicular to the velocity vector path. The Correct answers are:

a.) D

b.) B

c.) C

d.) A

A Vector is a quantity that has both magnitude and direction.

Given that a ball is fired from a cannon at point 1 and follows the trajectory shown in the figure.

a.) The vector best represents the ball's velocity at position 2 is D

b.) The vector best represents the ball's acceleration at point 2 is B

c.) Which vector best represents the ball's velocity at position 3 = C

d.) Which vector best represents the ball's acceleration at point = A

In trajectory, acceleration vector is not the same with the velocity vector but depends on the change in velocity. The acceleration path is perpendicular to the velocity vector path.

At point 3, since the ball path is parabolic, the velocity at that point is not equal to zero but will tend to take a horizontal path.

Learn more here: brainly.com/question/25519989

3 0

2 years ago

The specific heat capacity of a substance is the amount of energy associated with doing which of the following to 1kg of the sub

Rus_ich [418]

Answer:

Raising its temperature by $1^{\circ}C$

Explanation:

The specific heat capacity of a substance is defined as the amount of energy needed to raise the temperature of 1 kg of a substance by $1^{\circ}C$ .

The specific heat capacity of a substance essentially tells us how much energy is needed to heat the substance: the larger it is, the more energy is needed. The amount of energy needed to increase the temperature of a substance is given by

$Q=mC_s \DeltaT$

where

m is the mass of the substance

Cs is the specific heat capacity

$\Delta T$ is the temperature variation of the substance

8 0

2 years ago

Suppose a car manufacturer tested its cars for front-en4 collisions by hauling them up on a crane and dropping then; from a cert

Brrunno [24]

Answer:

Generally from third equation of motion we have that

$v^2 = u^2 + 2a[s_i - s_f]$

Here v is the final speed of the car

u is the initial speed of the car which is zero

$s_i$ is the initial position of the car which is certain height H

$s_i$ is the final position of the car which is zero meters (i.e the ground)

a is the acceleration due to gravity which is g

$v^2 = 0 + 2g[H - 0]$

=> $v = \sqrt{ 2 g H}$

$H = 9.86 \ m$

Explanation:

Generally from third equation of motion we have that

$v^2 = u^2 + 2a[s_i - s_f]$

Here v is the final speed of the car

u is the initial speed of the car which is zero

$s_i$ is the initial position of the car which is certain height H

$s_i$ is the final position of the car which is zero meters (i.e the ground)

a is the acceleration due to gravity which is g

$v^2 = 0 + 2g[H - 0]$

=> $v = \sqrt{ 2 g H}$

When $v = 50 \ km/h = \frac{50 *1000}{3600} = 13.9 \ m/s$ we have that

$13.9 = \sqrt{ 2 g H}$

=> $H = \frac{13.9^2}{2 * 9.8}$

=> $H = 9.86 \ m$

6 0

2 years ago

A hot-air balloon is floating above a straight road. To calculate their height above the ground, the balloonists simultaneously

docker41 [41]

Answer:

Height of the balloon is 6.923 miles or 11141.46m

Explanation:

We form two triangles with a common vertex so the relation of the angles is and the position both are measuring

$tan(27)=\frac{Op}{Ad}\\Op1=Ad*Tan(27)\\Op1=Ad*0.595$

The second triangle have the mileposts on the road that is a mile more so:

$tan(24)=\frac{Op}{Ad+1mile} \\Op=tan(24)*(Ad+1mile)\\Op=0.445*(Ad+1mile)$

$Op=0.445*Ad+0.445$

Now resolve the both equation to know the opposite side that is the height of the hot air balloon

$Op*0.595=Op*0.4452+0.4452\\Op*(0.595-0.4452)=0.4452\\Op*0.0643=0.4452\\Op=\frac{0.4452}{0.0643}$

$Op=6.923 mile$

Height=6.923miles

Leigth can be find also

$Ad=tan(27)*6.923\\Ad=3.52 miles$

The measure can be express in meters so

$6.923miles*\frac{1.60934km}{1mile}=11.4146km\\11.14146km*\frac{1000m}{1km}=11141.4608 m$

6 0

3 years ago

I've asked this question 5 times and still no answer pls help TT

salantis [7]

Answer:

Explanation:

B. Turn the steering wheel while the car is moving.

causes centripetal acceleration.

C. Press the gas pedal while the car is stopped.

causes forward acceleration.

D. Press the brake pedal while the car is moving.

causes rearward acceleration.

5 0

2 years ago

Read 2 more answers