PHYSICS
MIDDLE SCHOOL

Answer:

Given data

Force (F) = 8480 N,

acceleration (a) = -32 m/s² ,

mass of the car (m) = ?

We know that, from Newtons II law,

F = m.a

=> m = F ÷ a ,

= 8480 ÷ (-32)

= 265 Kg (Neglect negetive sign)

Mass of the car is 265 Kg

HIGH SCHOOL

A fishing boat using sonar to locate fish is employing _____. diffraction

reflection

refraction

interference

Answer: reflection

Explanation:

SONAR - Sound Navigation and Ranging

It works on the principle of Echo i.e. the reflection of sound. Sound waves are sent out which get bounced off a nearby object. The reflected sound waves is detected and distance to the object is estimated. Sonar is used to detect, navigate or communicate objects underwater. Thus, a fishing boat uses sonar to locate the fish. It is employing reflection.

The answer is Reflection

HIGH SCHOOL

PLZ HELP FAST!!!!!!!!!Which characteristics describe a maritime polar air mass? A.cold and humid air B.cold and dry air C.warm and humid air D.warm and dry air.

"Maritime" air . . . . . always high relative humidity

"Polar" air . . . . . always cold

"Maritime polar" air . . . . . choice-A

"Polar" air . . . . . always cold

"Maritime polar" air . . . . . choice-A

HIGH SCHOOL

Two objects that have different sizes, masses, and temperatures come into close contact with each other. 1) Thermal energy is transferred from the larger object to the smaller object.

a.from the object that has more mass to the one that has less mass.

b.from the object that has the higher temperature to the object that has the lower temperature.

c.from the object that has the lower temperature to the object that has the higher temperature.

d.back and forth between the two objects until they come to equilibrium.

Answer:

b. from the object that has the higher temperature to the object that has the lower temperature.

Explanation:

This is a result of the second law of thermodynamics. It tells us that heat will spontaneously flow from a hot object to a cold object regardless of the size of the objects until the objects are at thermal equilibrium.

Answer:

b. from the object that has the higher temperature to the object that has the lower temperature.

Explanation:

Thermal energy also known as heat energy.. The thermal energy is transferred from one body to another body due the difference in temperature. The heat travels from the body having greater temperature, to the body having the lower temperature. This process is spontaneous and continues till the bodies come into thermal equilibrium. Hence, the transfer of heat energy depends only upon the temperature difference between the bodies. And it is independent of the size or the mass of the bodies. Thus the correct answer will be:

b. from the object that has the higher temperature to the object that has the lower temperature.

MIDDLE SCHOOL

What is Newton's third law of motion

The third law states that for every action (force) in nature there is an equal and opposite reaction.

Hope this helps :D

Hope this helps :D

His third law states that for every action in nature there is an equal and opposite reaction.

He presented his three laws of motion in the "Principia Mathematica Philosophiae Naturalis."

He presented his three laws of motion in the "Principia Mathematica Philosophiae Naturalis."

COLLEGE

A 3 mm inside diameter tube is placed in a fluid with a surface tension of 600 mN/m and density of 3.7 g/cm3. The contact angle is measured as 60o below the horizontal. How high will the fluid rise in the tube?

Answer: The height of the fluid rise is 0.01m

Explanation:

Using the equation

h = (2TcosѲ )/rpg

h= height of the fluid rise

diameter of the tube =3mm

radius of the tube= 3/2 =1.5mm=0.0015

T= surface tension = 600mN/m=0.6N/m

Ѳ = contact angle = C

p= density =3.7g/cm3= 3700kg/m3

g= acceleration due to gravity =9.8m/s2

h = ( 2*0.6*0.5)/(0.0015*3700*9.8)

h = 0.6/54.39

h= 0.01m

Therefore,the height of the fluid rise is 0.01m

HIGH SCHOOL

Which points are 56 units from the point located at 13 on a number line? A. –69 and 69 B. –69 and 43 C. –43 and 69 D.

Well, one can take 13 and subtract 56 which is -43.

One can also add 56 to 13 to equal 69.

C is the answer.

COLLEGE

An object of mass 9.00 kg attached to an ideal massless spring is pulled with a steady horizontal force across a frictionless level surface. If the spring constant is 95.0 N/m and the spring is stretched by 10.0 cm , what is the magnitude of the acceleration of the object?

Answer:

Acceleration of the object will be

Explanation:

We have given mass of the object m = 9 kg

spring constant k = 95 N/m

Spring is stretched by 10 cm

So x = 10 cm = 0.1 m

We know that force is given by

From newton's law we also know that force is given by

F = ma , here m is mass and a is acceleration

So

COLLEGE

The size of the picture of a nanparticle is measured to be 5.2 cm by a ruler. If the scale bar size is 3 cm and is labeled 40 nm, find the actual size of the particle.

Answer:

The actual size is

69.33 nm.

Explanation:

It means that

3 cm is equivalent to 40 nm

So, 1 cm is equivalent to 40 / 3 nm

Thus, 5.2 cm is equivalent to

40 × 5.2 / 3 = 69.33 nm

COLLEGE

Haley is trying to pull an object upward. The below forces are acting on the object. Fp = 5500N

Fg = 6000N

Which represents the net force?

← 500N

→ 500N

↑ 500N

↓ 500N

Answer:

↓ 500N

Explanation: