How much force is needed to accelerate a 68 kilogram skier at a rate of 1.2m/sec

Answers

Answer 1

Answer:
Let's use Newton's 2nd law of motion:

Force = (mass) x (acceleration)

Force = (68 kg) x (1.2 m/s²) = 81.6 newtons .

Answer 2

Answer: $f=m*a$

68*1.2=81.6

$f=81.6$

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Answers

My answers are in the comments. Sorry for the repeated answers on some of them

A 360-N child is in a swing that is attached to a pair of ropes 1.90 m long. Find the gravitational potential energy of the child–Earth system relative to the child's lowest position at the following times.

Answers

Answer:

684J

Explanation:

So basically the formula for gravitational potential energy is Mass X Gravity X height. That is G.p.e = mgh

We don't have the mass but since we have the height, we multiply directly with the height since the quantity of weight is already given.

so G.p.e = 360 X 1.9 = 684J

Note that; The answer is in joules because g.p.e is work done.

Hope that was helpful!!

How many types of quarks are there?
a. 2
b. 4
c. 6
d. 8

Answers

There are 6 types of quarks.

Answer: C. 6

The are 6 types of quarks: up, down, strange, charm, top, and bottom.
The answer:

C.6

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)

How much net force is needed to accelerate a 15 kg mass at 2.8 m/s^2

Answers

Refer to the 2th Law of Newton

F = m. a

F = 15 x 2.8 = 42 N

What is the mass of a falling rock if it produces a force of 147 n?
F=
M=
A=

Answers

F=147N;

Acceleration=9.8m/s2;

Mass=15kg

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