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Anton [14]
3 years ago
9

A 1400.0 kg car crests a 3200.0 m pass in the mountains and briefly comes to rest. The car descends 1000 m before climbing and c

resting a 2800 m pass. (a) Neglecting friction, what should the speed of the car be at the top of the second pass? (b) Find the actual speed of the car if the work due to nonconservative forces is – 5 x106 J.
Physics
1 answer:
rjkz [21]3 years ago
4 0

Answer:

a) v = 88.54 m/s

b) vf = 26.4 m/s

Explanation:

Given that;

m = 1400.0 kg

a)

by using the energy conservation

loss in potential energy is equal to gain in kinetic energy

mg × ( 3200-2800) = 1/2 ×m×v²

so

1400 × 9.8 × 400 = 0.5 × 1400 × v²

5488000 = 700v²

v² = 5488000 / 700

v² = 7840

v = √7840

v = 88.54 m/s

b)

Work done by all forces is equal to change in KE

W_gravity + W_non - conservative = 1/2×m×(vf² - vi²)

we substitute

1400 × 9.8 × ( 3200-2800) - (5 × 10⁶) = 1/2 × 1400 × (vf²  -0 )

488000 = 700 vf²

vf² = 488000 / 700

vf² = 697.1428

vf = √697.1428

vf = 26.4 m/s

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Ber [7]

Answer:

Maximum torque on the wire is 1.34\times 10^{-4}\ N-m

Explanation:

It is given that,

Diameter of the wire, d = 11.1 cm = 0.111 m

Radius of wire, r = 0.0555 m

Magnetic field, B=2.79\ mT=0.00279\ T

Current, I = 5 A

We need to find the maximum torque on the wire. Torque is given by :

\tau=IAB\ sin\theta

Torque is maximum when, \theta=90

\tau=IAB

\tau=5\times \pi \times (0.0555)^2\times 0.00279

\tau=0.000134\ N-m

or

\tau=1.34\times 10^{-4}\ N-m

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6 0
3 years ago
Pls help me this is being timed. pls.
ahrayia [7]

Answer:

10N each

Explanation:

Doing a little math here to make it balanced. 10+10=20 therefore you have the same on both sides.

Hope this helps!

6 0
3 years ago
Which of the following lists are all renewable resources?
earnstyle [38]

The answer is A.

Hydroelectric, which is usually generating electricity through use of a dam.

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3 0
3 years ago
a0.155 kg arrow is shot from ground level, upward at 31.4 m/s. what is its kinetic energy (ke) when it is 30.0 m above the groun
swat32

The kinetic energy (KE) of a 0.155 kg arrow that is shot from ground level, upward at 31.4 m/s, when it is 30.0 m above the ground is 30.85 J

Assuming air friction is negligible,

a = - 9.8 m / s²

u = 31.4 m / s

s = 30 m

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KE = 1 / 2 * 0.155 * 397.96

KE = 0.0775 * 397.96

KE = 30.85 J

Therefore, the kinetic energy ( KE ) when it is 30.0 m above the ground is 30.85 J

To know more about kinetic energy

brainly.com/question/24360064

#SPJ1

5 0
1 year ago
Which theory proposes that the moon was a passing asteroid pulled into orbit by earth's gravity?
Dmitry_Shevchenko [17]
Hi,

The Capture Theory pro<span>poses that the moon was a passing asteroid pulled into orbit by earth's gravity. 

The Capture Theory is not a valid theory, per se. The Impact Theory is the theory most recognized. The theory states </span><span>that the moon formed from dust produced by a collision between Earth and another large body. 


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