For each picture below identify the material and closing the sandwich as transparent translucent or opaque

which statements about acceleration are true? check all that apply. a. the si units of acceleration are m/s2. b. for acceleratio

tatiyna

The first thing you should know is that acceleration is a vector, therefore, it has magnitude, and direction.

By definition, we have that the vector acceleration is given by:

$a = \frac{dv}{dt}\\$

Where,

dv/dt: derived from the velocity vector with respect to time,

Therefore, the units of the vector acceleration are:

$a = \frac{\frac{m}{s}}{s}\\$

$a = \frac{m}{s^2}$

The symbol of acceleration is:

$a^{->}$

Answer:

The statements about acceleration that are true are:

a. the si units of acceleration are m/s2.

b. for acceleration, you must have a number, a unit, and a direction.

d. the symbol for acceleration is (True, only if the symbol is the same as above)

5 0

3 years ago

Read 2 more answers

A large room in a house holds 947 kg of dry air at 33.2°C. A woman opens a window briefly and a cool breeze brings in an additio

BartSMP [9]

Answer:

31.96362 °C

Explanation:

$m_1$ = Mass of air in the room = 947 kg

$m_2$ = Mass of air entering the room = 62.4 kg

$T_1$ = Temperature in the room = 33.2°C

$T_2$ = Temperature air entering the room = 13.2°C

T = Equilibrium temperature

c = Specific heat of air = 1006 J/kg °C

In the case of thermal equilibrium we have the relation

$m_1c(T_1-T)=m_2c(T-T_2)\\\Rightarrow T=\frac{m_2T_2+m_1T_1}{m_1+m_2}\\\Rightarrow T=\frac{62.4(13.2+273.15)+947(33.2+273.15)}{947+62.4}\\\Rightarrow T=305.11362\ K=305.11362-273.15=31.96362^{\circ}C$

The temperature of thermal equilibrium is 31.96362 °C

7 0

3 years ago

some galaxies have regions that are relatively blue other regions appear redder what does this varuation indicate about the diff

Vinvika [58]

Answer:

Blue is hot while the red is cool.

Explanation:

Hot stars appear in blue whereas cooler stars appear to have red hues.

3 0

3 years ago

Scouts at a camp shake the rope bridge they have just crossed and observe the wave crests to be 5.85 m apart. If they shake the

quester [9]

Answer:

17.55 m/s

Explanation:

The number of times a wave will pass through a particular point is called frequency so, here the frequency is 3 Hz = f

The distance which is measured between two troughs or crests in a wave is called wavelength so, here the wavelength is 5.85 m = $\lambda$

Velocity is given by

$v=f\lambda\\\Rightarrow v=3\times 5.85\\\Rightarrow v=17.55\ m/s$

The propagation speed of the waves is 17.55 m/s

5 0

3 years ago

A penny is dropped from the top of a building 290 m high. Ignoring air resistance, if

Kryger [21]

Answer:

1. Velocity = 75.39 m/s

2. Air resistance

3. Mass of the coin

Explanation:

1. Given that the height of the building is 290 m. From Newton's third law of motion,

$V^{2}$ = $U^{2}$ + 2gh

where: V is the final velocity of the coin, U is the initial velocity, g is the force of gravity and h is the height.

Since the coin was dropped from a height, its initial velocity is zero. The force of gravity is taken as 9.8 m/ $s^{2}$ , so that:

$V^{2}$ = 0 + 2 x 9.8 x 290

= 5684

V = $\sqrt{5684}$

= 75.3923

The velocity with which the coin hits the ground is 75.39 m/s.

2. Air resistance: During the free fall of the coin, the direction of wind flow could either cause an increase or decrease the value predicted.

ii. Mass of the coin: This can also affect the predicted value.

5 0

3 years ago

For each picture below identify the material and closing the sandwich as transparent translucent or opaque￼

For each picture below identify the material and closing the sandwich as transparent translucent or opaque