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Norma-Jean [14]
3 years ago
12

A 15-N force and a 45-N force act on an object in opposite directions

Physics
1 answer:
lidiya [134]3 years ago
8 0

Answer:

30-N

Explanation:

Because they are both acting on an object going opposite directions, then you simply subtract the 15 from 45 as 45N of force is stronger than 15N of force.

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The electrical resistance of a wire varies directly as its length and inversely as the square of its diameter. a wire with a len
Annette [7]
The electrical resistance of the wire is proportional to its length L and inversely proportional to the square of its diameter, 1/r^2. 

The length of the wire in the problem is changed from 200 inches to 500 inches, so the new length is 2.5 times the initial length:
\frac{L_1}{L_0}= \frac{500}{200}=2.5
the diameter of the wire is not changed, so the new electrical resistance must be 2.5 times the original value:
R_1 = 2.5 R_0 = 2.5 \cdot 20 \Omega =50 \Omega
3 0
4 years ago
¿Qué magnitudes piensan que se relacionan mediante el<br> concepto de rapidez?
iragen [17]
La rapidez es una magnitud escalar que relaciona la distancia recorrida con el tiempo.

La velocidad es una magnitud vectorial que relaciona el cambio de posición (o desplazamiento) con el tiempo.
4 0
3 years ago
A hockey puck slides off the edge of a table with an initial velocity of 23.2 m/s and experiences no air resistance. The height
Dennis_Churaev [7]

Answer:

15.1°

Explanation:

The horizontal velocity of the hockey puck is constant during the motion, since there are no forces acting along this direction:

v_x = 23.2 m/s

Instead, the vertical velocity changes, due to the presence of the acceleration due to gravity:

v_y(t)= v_{y0} -gt (1)

where

v_{y0}=0 is the initial vertical velocity

g = 9.8 m/s^2 is the gravitational acceleration

t is the time

Since the hockey puck falls from a height of h=2.00 m, the time it needs to reach the ground is given by

h=\frac{1}{2}gt^2\\t=\sqrt{\frac{2h}{g}}=\sqrt{\frac{2(2.00 m)}{9.8 m/s^2}}=0.64 s

Substituting t into (1) we find the final vertical velocity

v_y = -(9.8 m/s^2)(0.64 s)=-6.3 m/s

where the negative sign means that the velocity is downward.

Now that we have both components of the velocity, we can calculate the angle with respect to the horizontal:

tan \theta = \frac{|v_y|}{v_x}=\frac{6.3 m/s}{23.2 m/s}=0.272\\\theta = tan^{-1} (0.272)=15.1^{\circ}

6 0
3 years ago
George rides his bike to his friend’s house that is 5 kilometers from his house. If he rides his bike at an average speed of 15
oksano4ka [1.4K]
I haven’t learned math in forever sorry
7 0
3 years ago
Measure the width of a sheet of a standard-sized (8.5in x 11.0in) loose-leaf notebook paper. Make the measurement in centimeters
laiz [17]

Answer: width = 27.94 cm

Explanation:

Given  a sheet of a standard-sized (8.5in x 11.0in) loose-leaf notebook paper.

From the value given, the width is 11.0 inches

To make the measurement in centimeters, we will convert inches into centimeters.

1 inche = 2.54 centimeters

That is, 11 × 2.54 centimeters = 27.94 cm.

Therefore, the width is 27.94 cm.

3 0
4 years ago
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