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2 years ago

Hammer falls off a roof top and strikes the ground with a certain kinetic energy. If it fell

Physics

1 answer:

Galina-37 [17]2 years ago

6 0

Answer:

If the starting GPE is doubled than it's KE would also double.

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In which situation is a person doing work on an object?

Hunter-Best [27]

Answer:

the answer is A. A school crossing guard raises a stop sign that weigh 10 N

6 0

2 years ago

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As a summer intern assigned to the Olympics Kayaking committee, you need to determine the speed of water flowing through a rapid

Nookie1986 [14]

Answer:

11.56521 m/s

Explanation:

$A_1$ = Area of first section = $14\times 2$

$A_2$ = Area of second section = $5\times 0.92$

$V_1$ = Velocity in first section = 1.9 m/s

$V_2$ = Velocity in second section

From the continuity equation we get

$A_1V_1=A_2V_2\\\Rightarrow V_2=\dfrac{A_1V_1}{A_2}\\\Rightarrow V_2=\dfrac{14\times 2\times 1.9}{5\times 0.92}\\\Rightarrow V_2=11.56521\ m/s$

The speed of the river through the section of rapids is 11.56521 m/s

5 0

2 years ago

A box is placed on a flat surface. Jane lifts one end of the surface, making an angle with the floor. As she increases the angle

ArbitrLikvidat [17]

Answer:

D- component of the gravitational force parallel to the plane increased and normal force exerted by the board decreased

Explanation:

component of the gravitational force parallel to the plane = mg sinθ ; where θ is inclination of the plane . As it increases , sinθ increases and hence component of the gravitational force parallel to the plane increases .

normal force exerted by the board = mg cosθ . As θ increases , cosθ decreases and hence normal force exerted by the board decreases and hence friction force decreases because

Friction force = coefficient of friction x normal force exerted by the board .

coefficient of friction remains constant.

6 0

2 years ago

Why do you think the carbon dioxide measurements have increased so much in the last 100 years or so?

Travka [436]

Answer:

Explanation:

Carbon Dioxide has increased in the last 100 years because we’ve been told it has. We don’t know via our own senses of course, so we just have to accept that it has. I personally don’t know how CO2 levels are measured since different parts of the world have different levels of CO2. For instance, the Pacific Ocean which occupies 30% of the entire planet has no trees or green plants at all and therefore absorbs only small amounts of CO2.

7 0

2 years ago

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An 10 kg mass has an applied force of magnitude 69N acting on it pushing it to move in the positive x-direction. The mass is on

Oduvanchick [21]

The net force on the mass in the vertical direction is

∑ F = n - w = 0

and the net horizontal force is

∑ F = A - f = ma

where

n = magnitude of the normal force

w = mg = weight of the mass

m = 10 kg, mass of the … uh, mass

g = 9.8 m/s², mag. of acceleration due to gravity

A = 69 N, mag. of the applied force

f = mag. of kinetic friction

From the first equation, we get

n = mg = (10 kg) (9.8 m/s²) = 98 N

Then the friction force has magnitude

f = µ n = 0.5 (98 N) = 49 N

Solve the mass's acceleration in the second equation:

69 N - 49 N = (10 kg) a

a = (20 N) / (10 kg) = 2.0 m/s²

in the positive x direction.

5 0

2 years ago