Question

1. The path of motion of a thrown javelin is an example of (blank) motion.
2. The acceleration of an object is equal to net (blank) acting on the object dividing by the objects (blank)
3. The pressure exerted by a fluid at any given depth is exerted (blank) in all directions.
4. A 38 kg canoe broke free of its dock and is now floating at a speed of 2.2 m/s. What is the canoe's momentum?
5. $a= \frac{ v_{f} -v_{i} }{t}$ please explain this equation in words.

Answer 1

Explanation :

(1) The path of motion of a thrown javelin is an example of projectile motion. It is a type of motion that is experienced by an object that is thrown near the earth's surface. The object then moves along a curved path under the influence of gravity.

(2)  Force is the product of mass and velocity i.e. F = ma

So,       $a=\dfrac{force}{mass}$

Hence, the acceleration of an object is equal to net force acting on the object dividing by the objects mass.

(3) The pressure exerted by a fluid at any given depth is exerted uniformly in all directions.

(4) Mass of canoe, m = 38 Kg

velocity of canoe, v = 2.2 m\s

momentum is given by, p = mv

$p=38\ Kg\times 2.2\ m/s$

$p=83.6\ Kg\ m/s$

So, momentum of canoe is 83.6 Kgm/s

(5) Acceleration is given by the rate of change of velocity per unit time. If $v_f$ is final velocity and $v_i$ is initial velocity,

Then change in velocity will be $v_f-v_i$

since, $a=\dfrac{change\ in \ velocity}{time}$

So, $a=\dfrac{v_f-v_i}{t}$

Answer 2

1. The path covered by the javelin will be a Projectile.

2. The acceleration of an object is equal to net Force acting on object dividing by object's mass.

3. The pressure exerted by a fluid at any given depth is exerted Uniformly in all directions.

4. The momentum of the canoe is $\boxed{83.6\text{ kg}\cdot\text{m/s}}$.

5. The acceleration of a body is defined as the ratio change in velocity to the time taken for change in velocity.

Explanation:

Part 1:

As the javelin is thrown, it is thrown by making some angle from the ground such that it covers some distance in the vertical direction and also some distance along the horizontal direction.

Therefore, as the javelin moves in both horizontal as well as vertical direction, its motion will be considered as the projectile motion.

Part 2:

According to Newton's second law of motion, the force acting on a body is defined as the product mass and acceleration of the body.

$F=m\cdot a$

Rearrange the above expression for acceleration.

$a=\dfrac Fm$

Thus, The acceleration of an object is equal to net Force acting on object dividing by object's mass.

Part 3:

In a fluid, the particles are considered to be in a random motion all throughout the space available to them. Therefore, the fluid is considered to exert equal pressure in all the directions.

Thus, The pressure exerted by a fluid at any given depth is exerted Uniformly in all directions.

Part 4:

The momentum of a body is defined as the product of mass and velocity of the object.

$p=m\times v$

Substitute the values of mass and velocity.

$\begin{aligned}p&=38\times2.2\\&=83.6\text{ kg}\cdot\text{m/s}\end{aligned}$

Thus, The momentum of the canoe is $\boxed{83.6\text{ kg}\cdot\text{m/s}}$.

Part 5:

The given equation defines that the acceleration of a body is defined as the ratio of the change of velocity of a body to the time taken by the body to change the velocity.

$a=\dfrac{v_f-v_i}{t}$

Thus, The acceleration of a body is defined as the ratio change in velocity to the time taken for change in velocity.

Learn More:

1. Net force acting on the refrigerator brainly.com/question/4033012
2. Velocity of the soccer ball during the projectile as it was caught brainly.com/question/11023695
3. Unit of the rotational velocity brainly.com/question/2887706

Answer Details:

Grade: High School

Subject: Physics

Chapter: Force and Pressure

Keywords:

momentum, force, mass, velocity, pressure, fluid, path, javelin, projectile, motion, acceleration, given depth, canoe, broke free, equation.