All categories

3 years ago

Help...? Pls..?... Maybe..? Haha... Please

Physics

1 answer:

Gnoma [55]3 years ago

4 0

Answer:

A force that resists motion between two objects that are in contact; rubbing together of two objects = <em>Friction</em>

<em />

The tendency of an object to float = <em>Buoyancy</em>

<em />

A push or pull; any quantity that produces or is capable of producing motion = <em>Force</em>

<em />

A universal force that every mass exerts on every other mass; this keeps us down on earth = <em>Gravity</em>

<em />

A free body diagram is a diagram that labels all the forces acting on an object. This allows us to find the net force on an object = <em>Free body diagram</em> (it literally says it in the definition lol)

<em />

You might be interested in

On February 15, 2013, a superbolide meteor (brighter than the Sun) entered Earth’s atmosphere over Chelyabinsk, Russia, and expl

topjm [15]

Explanation:

Using the wave equation:

v = d/t

Where,

v = velocity

d = distance

= 23.5 km

= 23500 m

t = time

= 2m 30s = 150 s

v = 23500/150

= 156.7 m/s

From the calculated value above, it can be seen that the velocity of the heat blast is >>> than the velocity of sound above sea level.

3 0

3 years ago

¿que es hipótesis?¿que es teoría?

Ludmilka [50]

Answer:

The hypothesis is only an assumption that has not yet been proven, when it has been tested, and it cannot be shown that it is false, then it is no longer a simple hypothesis, it is a Theory. Hypothesis is when we raise a supposed result. Theory is the result of an experiment.

Explanation:

4 0

3 years ago

Read 2 more answers

A student holds two pieces of paper at the top, 10 cm apart. The flat sides of the papers face each other.

Aleksandr [31]

When the student uses a straw to blow a stream of air between the papers, the <span>two pieces of paper come together because the pressure between the two was lowered. This follows the Bernoulli’s Principle. Hope this answers the question. Have a nice day.</span>

4 0

3 years ago

Annealing is a process by which steel is reheated and then cooled to make it less brittle. Consider the reheat stage for a 100-m

Anit [1.1K]

Complete question is;

Annealing is a process by which steel is reheated and then cooled to make it less brittle. Consider the reheat stage for a 100 mm thick plate (ρ = 7830 kg/m³, Cp = 550 J/Kg.K, k = 48 W/m K). The plate initially is at 200 °C and is to be heated to a minimum temperature of 550 °C. Heating is effected in a gas-fired furnace where the products of combustion at T∞ = 800 °C maintain a convection heat transfer coefficient of h = 250 W/m.K on both surfaces of the plate. How long should the plate be left in the furnace?

Answer:

860 seconds

Explanation:

We are given;

Initial Temperature; T_i = 200 °C

Minimum Temperature; T_o = 550 °C

T∞ = 800 °C

convection coefficient; h = 250 W/m².K

ρ = 7830 kg/m³

Cp = 550 J/kg K

k = 48 W/m K

Plate thickness = 100mm

Thus,L = 100/2 = 50mm = 0.05 m

Let's find the biot number from the formula;

Bi = hL/K

Bi = (250 × 0.05)/48

Bi = 0.2604

Now, lowest temperature in the slab is given as;

θ_o = (T_o - T∞)/(T_i - T∞)

θ_o = (550 - 800)/(200 - 800)

θ_o = 0.4167

Now, from online tables calculation, we can find the root of the biot number.

Thus, root of the biot number Bi = 0.2604 is;

ζ1 = 0.488 rad

Also, C1 is gotten as 1.0396

Now,formula for thermal diffusivity is;

α = k/ρc

α = 48/(7830 × 550)

α = 1.115 × 10^(-5) m²/s

Also, from online tables, f(ζ1) = 0.401

Thus, we can find the time the plate should the plate be left in the furnace from;

-(ζ1)²(αt/L²) = In 0.401

-(ζ1)²(αt/L²) = -0.9138

t = (-0.9138 × 0.05²)/-(0.488² × 1.115 × 10^(-5))

t ≈ 860 s

3 0

3 years ago

In heavy rush-hour traffic you drive in a straight line at 12 m/s for 1.5 milrutes, then you have to stop for 3.5 minutes, and f

g100num [7]

Average velocity between t= 0 and t = 7.5 minutes = 7.4 m / s

<h3>Further explanation </h3>

Regular straight motion is the motion of objects on a straight track that has a fixed speed

Formula used

$\large{\boxed{\boxed{\bold{S\:=\:v\:\times\:t}}}$

S = distance = m

v = speed = m / s

t = time = seconds

The motion of objects can be expressed in graphical form

This relationship graph can be in the form of a graph S-t, v-t or a-t

From the S-t graph, the average speed can be determined by determining the slope distance of the curve line from the distance to time ratio

average velocity = distance traveled / time taken

From the statement of questions there are 3 stages of time that occur

1. first time

move with v = 12 m / s, t = 1.5 min = 90 s

So the distance traveled =

s = v x t

S = 12. 90

S = 1080 m

2. second time

stop (v = 0) so that s = 0 and t = 3.5 min = 210 s

3. third time

move with v = 15 m / s and t = 2.5 min = 150 s

so the distance traveled

s = v x t

s = 15 x 150

s = 2250 m

Total distance = 2250 + 1080 = 3330 m

If we look at the existing chart (attached)

then we can draw a straight line from the starting point to the end point so we get a slash curve that shows the average speed

v average = distance traveled / time taken

v average = 3330/450

v average = 7.4 m / s

<h3>Learn more </h3>

The distance of the elevator

brainly.com/question/8729508

velocity position

brainly.com/question/2005478

resultant velocity

brainly.com/question/4945130

Keywords: average velocity, Motion of objects, s-t graph

6 0

4 years ago

Read 2 more answers