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3 years ago

on june 21 some earth locations have 24 hours of daylight these locations are all between the latitudes of

Physics

1 answer:

andrew-mc [135]3 years ago

4 0

66° N and 90° N

the area of the artic circle in the northern hemisphere

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Which event happens as the amplitude of a light wave increases?

Nataliya [291]

Answer:

Explanation:

the light. appears dimmmer

4 0

3 years ago

Read 2 more answers

A 1.30 kg skateboard is coasting along the pavement at a speed of 6.64 m/s when a 0.680 kg cat drops from a tree vertically down

nikdorinn [45]

Answer:

$v_f=4.36\frac{m}{s}$

Explanation:

The principle of conservation of linear momentum states that if the sum of forces acting on a system is zero, its linear momentum remains constant over time. So, in this case we have:

$\Delta p=0\\p_i=p_f\\m_sv_i_s+m_cv_i_c=m_sv_f_s+m_cv_f_c$

The cat drops downward, so their initial speed horizontally is zero( $v_i_c=0$ ). The skateboard and the cat collide and stick together, so their final speeds are the same( $v_f_s=v_f_c=v_f$ ):

$m_sv_i_s=(m_s+m_c)v_f\\v_f=\frac{m_sv_i_s}{m_s+m_c}\\v_f=\frac{1.3kg(6.64\frac{m}{s})}{1.3kg+0.68kg}\\v_f=4.36\frac{m}{s}$

7 0

3 years ago

At what angle should the roadway on a curve with a 50m radius be banked to allow cars to negotiate the curve at 12 m/s even if t

kari74 [83]

Answer:

The road bank angle is 16.38⁰.

Explanation:

radius of curvature of the road, r = 50 m

allowable speed of car on the road, v = 12 m/s

The bank angle is calculated as;

$\theta = tan^{-1} (\frac{v^2}{gr} )$

where;

θ is the road bank angle

g is acceleration due to gravity = 9.8 m/s²

$\theta = tan^{-1} (\frac{v^2}{gr} )\\\\\theta = tan^{-1} (\frac{12^2}{9.8 \times 50} )\\\\\theta = tan^{-1} ( 0.2939)\\\\\theta = 16.38 ^0$

Therefore, the road bank angle is 16.38⁰.

8 0

2 years ago

"A hiker starts at point P and walks 2.0 kilometers due east and then 1.4 kilometers due north. The vectors in the diagram below

nadezda [96]

Here, you need to use your "Protractor" as it is given in the question, but we can calculate the value with the help of our mathematical calculation too:
[ Protractor can be use only in real life, not here ]

Draw an imaginary line from initial position to final position.
Now, In that triangle, tan x = P/B
tan x = 1.4 / 2
tan x = 0.70
x = tan⁻¹ (0.70)
x = 35 [ tan 35 = 0.70 ]

In short, Your Answer would be 35 degrees

Hope this helps!

4 0

3 years ago

________is what causes acceleration. Two forces acting opposite each other.

agasfer [191]

Answer: Unbalanced forces

Explanation:

An unbalanced force is the type of force that causes change in speed or direction of a moving object or a body in motion, it is an unequal and opposite force.

A net force=unbalanced force.

5 0

3 years ago