What determines the atomic mass of an element? A.
the sum of the neutrons and the electrons

B.
the sum of the protons and electrons

C.
the sum of the ions and isotopes

D.
the sum of the protons and the neutrons

Answers

Answer 1

Answer: D. protons + neutrons. Electrons have relatively small mass compared to them.

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An unbalanced force of 40. newtons keeps a5.0-kilogram object traveling in a circle of radius 2.0 meters. What is the speed of the object? (1) 8.0 m/s (3) 16 m/s (2) 2.0 m/s (4) 4.0 m/s

. A ray of monochromatic light (f = 5.09 × 1014hertz) in air is incident at an angle of 30.°
on a boundary with corn oil. What is the angle of refraction, to the nearest degree, for this
light ray in the corn oil?

Answers

The angle of refraction of light ray in the corn oil is 20°.

What is angle of Refraction?

Angle of refraction is the angle the refracted light ray makes with the normal to the oil-air interface.

Given data:

Angle of incidence = 30°

Analysis:

The refractive index of oil is 1.47.

Using the formula for refractive index(n) = $(sini)/(sinr)$

1.47 = $(sin 30)/(sin r)$

1.47(sin r) = sin 30

sin r = $(sin 30)/(1.47)$

sin r = 0.3401

r = arc sin(0.3401)

r = 19.88° which is approximately 20°

Learn more about Refraction : brainly.com/question/10729741

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Answer:

its 20 degrese

Explanation:

a horse moves a sleigh 1.00 kilometers by applying a horizontal 2000 Newton force on its harness for 45 minutes. what is the power of the horse?

Answers

-- If 2,000 newtons of force were applied through a distance of 1,000 meters,
then 2,000,000 newton-meters = 2,000,000 joules of work were done.

-- 45 minutes = (45 x 60) = 2,700 seconds

-- Power = (work) / (time) = (2,000,000 j) / (2,700 s) = 740.74 watts

Interestingly, that's almost exactly 1 horsepower. (0.99295... of 746 watts)

Why do we insulate houses?A. To prevent heat transfer from inside to
the outside
B. To allow energy to flow from inside to
the outside
C. To keep them cool in the winter and
warm in the summer

Answers

B to allow energy to flow from inside to the outside

The figure shows a velocity-versus-time graph for a particle moving along the x-axis. At t=0s, assume that x=0m. What is the particle's position at t=3.0s?

Answers

distance = area under graph v-t
area = 4x2 + 1x(2+4)/2 = 11
at 3s, particle is at 11m

What force is necessary to accelerate a 70-kg object at a rate ifm4.2 m/s

Answers

F = ma
F = force
m = mass
a = acceleration

4.2 m/s = a
70 kg = m
F = ?

F = 4.2*70
F = 294 Newtons

Answer would then be : Force = 294 N

A growing person needs a diet that supplies about 10MJ of energy per day. Calculate the amount of energy supplied by such a diet each second, and hence the person’s average power. (Give your answer to the nearest 10W)