A constant magnetic field can be used to produce an electric current. True or False?

Question 2 (1 point)

HACTEHA [7]

Answer:

Actually, there is no force (felt by the object) acting on the object.

It is similar to an object in orbit around the earth (weightlessness)

F = M a describes the motion of the particle where

M a = M g where the acceleration of the particle is equal to the force of gravity acting on the particle

From an external view the only force acting on the particle is M g and it produces an acceleration of M g

6 0

2 years ago

A student decides to move a box of books into her dormitory room by pulling on a rope attached to the box. She pulls with a forc

____ [38]

Answer:

Part a)

$a = 0.36 m/s^2$

Part b)

$a = -1.29 m/s^2$

Explanation:

Force applied by the student on the box is 80 N at an angle of 25 degree

so here two components of the force on the box is given as

$F_x = Fcos25$

$F_x = 80 cos25 = 72.5 N$

$F_y = Fsin25$

$F_y = 80 sin25 = 33.8 N$

now in vertical direction we can use force balance for the box to find the normal force on it

$F_n + F_y = mg$

$F_n = (25)(9.81) - 33.8$

$F_n = 211.45 N$

now kinetic friction on the box opposite to applied force due to rough floor is given as

$F_k = \mu F_n$

$F_k = (0.300)(211.45) = 63.44 N$

now the net force on the box in forward direction is given as

$F_{net} = F_x - F_k$

$F_{net} = 72.5 - 63.44 = 9.065 N$

now the acceleration of the box is given as

$a = \frac{F_{net}}{m}$

$a = \frac{9.065}{25} = 0.36 m/s^2$

Part b)

when box is pulled up along the inclined surface of angle 10 degree

now the two components of the force will be same along the inclined and perpendicular to inclined plane

$F_x = 72.5 N$

$F_y = 33.8 N$

now force balance perpendicular to inclined plane is given as

$F_n + F_y = mgcos\theta$

$F_n = (25)(9.81)cos10 - 33.8 = 207.7 N$

now the friction force opposite to the motion on the box is given as

$f_k = \mu F_n$

$f_k = (0.300)(207.7) = 62.3 N$

now the net pulling force along the inclined plane is given as

$F_{net} = F_x - F_k - mgsin10$

$F_{net} = 72.5 - 62.3 - (25)(9.81)sin10$

$F_{net} = -32.38 N$

now the box will decelerate and it is given as

$a = \frac{F_{net}}{m}$

$a = \frac{-32.38}{25} = -1.29 m/s^2$

7 0

3 years ago

The speed of sound in humid air than in dry air. Why

Elden [556K]

Answer:

When moisture is removed from air, its density increases. The speed of sound in a humid air is inversely proportional to the square root of its density. Therefore, the speed of sound in moist air is humidity increases, the velocity of sound increase and vice-versa.

Hope it helps :)

3 0

2 years ago

Standing still, Bruce, the quarterback, gets tackled by Biff, the 90.0-kg tackle, who is traveling at 7.0 m/s. Upon collision, B

Nataly_w [17]

Answer:

pls answer this for me

Explanation:

Which statement best describes an example of selective breeding?

A. People grow many radish plants from a package of radish seeds.

B. People use viruses to place certain genes in the cells of plant

tissues O

C. People use enzymes to cut DNA into pieces that are put back together.

D. People grow rose plants whose flowers have petals of a specific color.

5 0

2 years ago

Read 2 more answers

A cylinder has a height of 5.3 cm and a diameter of 3.0 cm. What is its volume

Igoryamba

Formula to find the volume of cylinder is pi×r^2×h ; r --radius ; h -- height Therefore,vol of cylinder is pi×1.5^2×5.3 = 11.925pi = 37.5 ( rounded off to 3s.f)

3 0

3 years ago