A man is paddling a kayak with the force of 254 N, at an acceleration of 1.39 m/s2. If the kayak weighs 30 kg, what is the mass of the man?

Answers

Answer 1

Answer: The answer is approximately 152.73kg. But if you report it to the correct significant figure, it will round up to 200Kg.

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An oil tanker, initially traveling west at 18 km/h is accelerated uniformly until it is traveling east at 21.6 km/h. The acceleration is 0.20 m/s2 towards the east. Compute the total displacement from the tanker’s initial position.Answer in meters.

Answers

Answer:

27.5 m

Explanation:

Given:

u = 18 km/h = 5 m/s

v = 21.6 km/h = 6 m/s

a = 0.20 m/s²

Find: s

v² = u² + 2as

(6 m/s)² = (5 m/s)² + 2 (0.20 m/s²) s

s = 27.5 m

In 2009, a Jamaican sprinter Usain Bolt created a world record in Berlin by running 100 m in just 9.58 seconds. What is his average speed?

Answers

To find Usain Bolt's average speed, you can use the formula for average speed:

Average Speed = Distance / Time

In this case, the distance is 100 meters, and the time is 9.58 seconds. Plug these values into the formula:

Average Speed = 100 meters / 9.58 seconds

Now, calculate the average speed:

Average Speed ≈ 10.44 meters per second

So, Usain Bolt's average speed during his world-record 100-meter sprint was approximately 10.44 meters per second.

Which of the following seismic wave moves the fastest

Answers

The P wave is the fastest seismic wave.

Which of the following is an example of diffraction? A. Hearing a band play through an open doorway without seeing them. B. Sitting in a room and watching a band play. C. Playing in a band. D. None of these examples show diffraction.

Answers

A because diffraction is the bending of waves around small obstacles or openings. That’s why you can hear a band through an open doorway without seeing them

Which memory disorder is a common illness on television and films

Answers

amnesia is the most common illness used in tv an films

The most common memory disorder in a show or movie is Alzheimer's Disease

Assume that the upward direction is positive and the downward direction is negative. What is the ball's velocity (in m/s) when it returns to the level where it left your hand? (Indicate the direction with the sign of your answer.)

Answers

The given question is incomplete. The complete question is as follows.

You throw a ball vertically upward, and as it leaves your hand, its speed is 26.0 m/s.

(a) How high (in m) does it rise above the level where it leaves your hand?

(b) How long (in s) does it take to reach its highest point?

(c) How long (in s) does the ball take to return to the level where it left your hand after it reaches its highest point?

(d) Assume that the upward direction is positive and the downward direction is negative. What is the ball's velocity (in m/s) when it returns to the level where it left your hand? (Indicate the direction with the sign of your answer.)

Explanation:

(a) For maximum height, the formula will be as follows.

$v^(2) = u^(2) + 2as$

a = $v^(2) - 2gh$

or, h = $(v^(2))/(2g)$

= $((26)^(2))/(2 * 9.8)$

= $(676)/(19.6)$

= 34.5 m/s

Hence, it rises 34.5 m/s above the level where it leaves your hand.

(b) Time to reach maximum height is as follows.

v = u + at

or, v - gt = 0

t = $(v)/(g)$

= $(26)/(10)$

= 2.6 sec

Therefore, it will take 2.6 sec to reach its highest point.

(c) Time taken by the ball to ascent is equal to the time it has taken to descent.

Therefore, time taken by the ball to return to the level where it left your hand after it reaches its highest point? is also 2.6 sec.

(d) Speed of the ball will be 26 m/s in the downward direction. Hence, the velocity will be -26 m/s.

Final answer:

When the ball returns to the level where it left your hand, its velocity will be negative.

Explanation:

To determine the ball's velocity when it returns to the level where it left your hand, we need to consider the forces acting on the ball. When the ball is released, it experiences the force of gravity pulling it downwards. As it travels upwards, the force of gravity slows it down until it reaches its maximum height and momentarily stops. Since the upward direction is positive, the ball's velocity will be negative when it returns to the level where it left your hand.

When a ball is thrown upwards, it will eventually succumb to gravity and fall back to the starting position. This is generally known as projectile motion.

Learn more about Ball's velocity when returning to hand here:

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