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3 years ago

Calculate their speed between points A and B. Include the units.

Physics

1 answer:

N76 [4]3 years ago

6 0

<h3>Speed between point A and B</h3>

= Total Distance/Total time

= 30/3

= 10 km/h

<h3>Average speed for this ride</h3>

Average speed = Total distance travelled/time taken

= 50/6

= 8.3 km/h

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What is the ﬁnal equilibrium temperature when 12 g of milk at 7◦C is added to 175 g of coﬀee at 69◦C? Assume the speciﬁc heats o

lina2011 [118]

Answer:

ﬁnal equilibrium temperature is 65.02 ◦C

Explanation:

Given data

milk = 12 g

temp milk = 7◦C

coffee = 175 g

coffee temp = 69◦C

to find out

ﬁnal equilibrium temperature

solution

we apply here equilibrium condition i.e m c ΔT

milk mass × c × ΔT = coffee mass × c × ΔT

12 × 1 × (T- 7) = 175 × 1 × ( 69- T)

12T - 84 = 12075 - 175 T

187 T = 12159

T = 65.02

so ﬁnal equilibrium temperature is 65.02 ◦C

3 0

4 years ago

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7 0

3 years ago

Consider two less-than-desirable options. In the first you are driving 30 mph and crash head-on into an identical car also going

4vir4ik [10]

Answer:

B. The force would be the same in both cases.

Explanation:

According to Newton's 3rd law where impulse was equated to the momentum formula.

F × t = M × V

where,

Force = F

V = velocity

Since, Impulse is force multiplied by time, whereas the time of contact is the same for both, therefore the impulse is the same in magnitude for the two trucks.

Case 1: Hitting the other car

Case 2: Hitting the brick wall

In Case 1, both the cars are identical and have same velocity whereas in the Case 2, the wall is stationary.

The case of hitting the brick wall have the same impact force as hitting the other car, because they have the same change in momentum.

Therefore, The force would be the same in both cases.

6 0

4 years ago

Two long, parallel wires are separated by a distance of 2.00 cm . The force per unit length that each wire exerts on the other i

RUDIKE [14]

Answer:

a) current in the second wire is 5.60A

b) opposite directions

Explanation:

a) We need to find the current of wire, the magnitude of the force per unit length between the two wires carrying current I and I¹ is given by

$\frac{F}{L} = \frac{U_0I^1}{2\pi r} \\\\I^1 = \frac{F2\pi r}{LU_0I}$

$= (3.6 * 10^-^5)\frac{2\pi (0.02)}{4\pi * 10^-^7)(0.64)} \\= 5.60A$

b) knowing that for a two parallel conductor carrying current in the same direction attracts each other, and for a two parallel conductors carrying carying current in opposite direction repels eachother.

therefore, since the two wire repel each other then the current in the second wire must flow in the opposite direction of the current in the first wire.

7 0

4 years ago

One can estimate the oil reservoir pressure underground from the height the oil rises. Of the gusher rises to 200 ft above groun

aniked [119]

Answer:

12,608 kPa

Explanation:

First we need to convert the density to standard units, that is kg/m^3

0.85 g/cm^3 = 0.85 × $\frac{100^{3} }{1000}$ = 0.85 × 1000 = 850 kg/m^3

Pressure of oil = pressure at surface + rho × g × h

= 101,000 + (850×9.81×1500)

= 12,608 kPa

The units in the part 'rho.g.h' will cancel out against each other and you will be left with the unit Pascals - which is the unit for pressure.

Hope that answers the question, have a great day!

4 0

3 years ago