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4 years ago

What is the difference between negative and positive acceleration?

1 answer:

6 0

Answer: Positive acceleration means increase in velocity with time. Negative acceleration means the speed reduces with the time.

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In how many places did the object stop moving? How do you know?

scZoUnD [109]

Explanation:

The object stops moving in 5 places (namely B, D, F, H, and position after 28 seconds which isn't marked ).

We know that the object has stopped moving, since its position does not change with the passage of time i.e. at rest.

6 0

3 years ago

In her hand, a softball pitcher swings a ball of mass 0.245 kg around a vertical circular path of radius 59.8 cm before releasin

GuDViN [60]

Answer:

The velocity is $v_b = 20.17 \ m/s$

Explanation:

From the question we are told that

The mass of the ball is $m = 0.245 \ kg$

The radius is $r = 59.8 \ cm = 0.598 \ m$

The force is $F = 30.9 \ N$

The speed of the ball is $v = 16.0 \ m/s.$

Generally the kinetic energy at the top of the circle is mathematically represented as

$K_t = \frac{1}{2} * m * v^2$

=> $K_t = \frac{1}{2} * 0.245 * 16.0 ^2$

=> $K_t = 31.36 \ J$

Generally the work done by the force applied on the ball from the top to the bottom is mathematically represented as

$W = F * d$

Here d is the length of a semi - circular arc which is mathematically represented as

$d = \pi * r$

$W = 30.9 * 0.598$

$W = 18.48 \ J$

Generally the kinetic energy at the bottom is mathematically represented as

$K_b = \frac{1}{2} * m * v_b^2$

=> $K_b = \frac{1}{2} * 0.245 * v_b^2$

=> $K_b = 0.1225 * v_b^2$

From the law of energy conservation

$K_t + W =K_b$

=> $31.36+ 18.48 = 0.1225 * v_b^2$

=> $v_b = 20.17 \ m/s$

3 0

3 years ago

A force has both______ and _______. Question 1 options: Speed and impact Magnitude and direction Motion and speed Direction and

Travka [436]

Answer:

magnitude

and direction

Explanation:

5 0

2 years ago

A pair of opposite electric charges of equal magnitude is called a(n)

nataly862011 [7]

Answer:

Dipole

Explanation:

A pair of opposite electric charges of equal magnitude is called a(n)

6 0

3 years ago

A car starts from rest and after 7 seconds it is moving at 69 m/s. What is the car’s average acceleration?

a_sh-v [17]

Answer:

6m/s squared

Explanation:

We'll use a simple kinematic equation to solve this.

v=v⊕at

5 0

4 years ago