a 42.3 kg girl and a 7.93 kg sled are on the surface of a frozen lake, 15.0m apart and linked by a rope, but not moving yet. then the girl pulls on the rope, exerting a 5.76 N force on the sled, pulling it toward her. how far from the girl's original position do they meet?

Answers

Answer 1
Answer:

Answer:

they meet from the girl's original position at: 2.37 (meters)

Explanation:

We need to use the Newton's law, exactly the second law that relate force, mass and acceleration as: F=m*a with this we can get both accelerations; solving for acceleration a=(F)/(m). Now a_(girl)=(5.76)/(42.3)=0.14 (m/s^(2)) anda_(sled)=(5.76)/(7.93)=0.73(m/s^(2)). Then knowing that they both travel at the same time and assuming that the distance among the girl and the sled is: 15.0-x, so, x=(1)/(2)*a_(girl)*t^(2) and15.0-x=(1)/(2)*a_(sled)*t^(2), solving for the time we get:t=\sqrt{(2x)/(a_(girl) ) } and t=\sqrt{(2*(15.0-x))/(a_(sled) ) } with this equations we solving for the x that is the distance between the girl and the sled after the apply the force and we get:\sqrt{(2x)/(a_(girl))} = \sqrt{(2*(15.0-x))/(a_(sled) ). Finally we get:(x)/(a_(girl) )=((15.0-x))/(a_(sled) ) and replacing the values we have got:(x)/(0.14) =((15.0-x))/(0.73) so 5.33*x=15-x so x=2.37 (meters).


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Which type of tape is used to round sharp edges on splices using larger conductors?a. Friction tape
b. Rubber tape
c. Cotton tape
d. Plastic tape

Answers

Rubber tape is used to round sharp edges

Answer:

Explanation:

the answer is rubber tape not friction tape

Is work done if you carry a book across the room at a constant velocity?a. No, the force applied is parallel to the direction of motion.
b. Yes, the force applied is parallel to the direction of motion.
c. No, the force applied is perpendicular to the direction of motion.
d. Yes, the force applied is perpendicular to the direction of motion.

Answers

Answer:

No, the force applied is perpendicular to the direction of motion.

Explanation:

Work done is given by :

W=Fd\ cos\theta

F = force

d = displacement

\theta = angle between force and displacement

Work is positive when the force and the displacement are in same direction. Work is negative when the force and the displacement are in opposite direction. When the force and displacement are perpendicular to each other, no work is done.

If we carry a book across the room at a constant velocity, the work done is zero. This is because our weight is acting vertically downward and we are moving forward. The angle between the force and the displacement is 90. So, no work is done.

Hence, the correct option is (c) "No, the force applied is perpendicular to the direction of motion".

No.  Work is not done if you carry a book across the room
at a constant velocity?

The force applied is perpendicular to the direction of motion. (C)

What allows us to stand upright and keeps us from falling through the ground?

Answers

while gravitational pull pulls us down the opposing force pusshes us upward and cancels each other out

Our spine and our muscles keep us standing up right, but the falling part I have no idea, I was wondering that myself.

Which of the following statements about ice melting is true and why?A. Energy flows from the ice to its surroundings.
B. Water molecules move from their fixed position.
C. Water molecules lose energy.
D. The temperature of the ice increases as it melts.

Answers

The answer for this question is part B that is Water molecules move from their fixed position.


This is because when water is freeze it is in a solid condition that means the molecules are held together tightly and are are vibrating in their fixed positions.


As soon as the molecules gain energy they start to move around from their fixed positions and turn into a liquid.


In the process of doing so ice melts and becomes water.

option(D) is true
the ice molecules are taking in heat from its surroundings to melt and form water.This increases the temperature of ice as it melts.
option(c) can also be true because to form water,the intermolecular force between the molecules gets weak which allows them to move from their fixed point.

What are the problems with monoculture farming?

Answers

One pest or disease can wipe out the whole crop population. Leading to lower yields.

A 5 kg box is sliding across a level floor. The box is acted upon by a force of 27 newtons east and a frictional force of 17 newtons west. What is the magnitude of the acceleration of the box? Type only numbers. Do not include the units of m/s2.

Answers

Answer:

The acceleration of the box is 2.

Explanation:

According to Newton's second law of motion, the acceleration of any object will be directly proportional to the net unbalanced force acting on the object and inversely proportional to the mass of the object.

Net force = Mass × Acceleration

So Acceleration = (Net force)/(Mass)

Since in this case, the box is experiencing a force from east of magnitude 27 N and resisting force of about 17 N from west. So the net force will be the difference of acting and reacting force.

Net force = 27-17 = 10 N.

Thus, Acceleration = (10 N)/(5 kg)

So 2 m/s^(2) is the acceleration of the box. Thus the magnitude of acceleration of the box is 2.