Race car drivers must slow down as they make turns on the track. This is best explained by the law of inertia. Which statement best describes inertia for the car going around a turn? A) A body in motion stays in motion at the same speed.
B) The speed of the car going into the turn must be conserved.
C) The speed around a turn is proportional to the radius of curvature of the turn.
D) A body in motion tends to continue in a straight line and requires a force to turn.

Answers

Answer 1

Answer:

Answer:

D) A body in motion tends to continue in a straight line and requires a force to turn.

Explanation:

A body in motion tends to continue in a straight line and requires a force to turn. Also, If no force is applied the race cars will keep moving in a straight line at constant speed and this will definitely lead to an accident/breakdown.

Answer 2

Answer: It was D! I took a test on this and it was right.

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A toaster oven has a power rating of 1200W. If you cook a pizza in it for 1 hour at 450°F, how manyjoules of electrical energy are converted into heat by the toaster oven?

Answers

Answer;

= 4,320,000 joules

Explanation;

Power is the ratio of Work per unit time. When work is done in a given span of time, the ratio of work performed with respect to time is called Power.

Therefore;

Power = Work done/time

Power = 1200 Watts and t = 1 hour or 3600 seconds

Thus;

Work done = Power × time

= 1200 × 3600

= 4,320,000 joules or 4320 kJ

A worker kicks a flat rock lying on a roof. The rock slides up the incline 10.0 m to the apex of the roof, and flies off the roof as a projectile. What maximum height (in m) does the rock attain? Assume air resistance is negligible, vi = 15.0 m/s, μk = 0.425, and that the roof makes an angle of θ = 42.0° with the horizontal. (Assume the worker is standing at y = 0 when the rock is kicked.)

Answers

The maximum height that the rock attains is : 7.42 m

Given data :

Vi = 15.0 m/s

uk = 0.425

angle made by roof ( θ ) = 42.0°

Calculating the maximum height reached by the rock

First step : calculate the deceleration of the rock

a = g*sinθ + uk * g * cosθ

= 9.8 * sin 42° + 0.425 * 9.8 * cos 42°

= 9.65 m/s²

Applying motion formula

v² = u² + 2as

= 15² - 2 * 9.65 * 10

v = 5.66 m/s

Initial height attained ( h₁ ) = 10 sin θ

= 10 * sin 45°

= 6.69 m

considering vertical height

V (y) = v sin θ

= 5.66 sin 42

= 3.79 m/s

Next step : Calculate height ( h₂ )

v² = u² + 2 a s

0 = 3.79² - 2 * 9.8 * h₂

therefore : h₂ = 0.73 m

The maximum height attained by the rock ( H ) = h₁ + h₂

= 6.69 + 0.73 = 7.42 m

Hence we can conclude thatThe maximum height that the rock attains is : 7.42 m

Learn more about projectile : brainly.com/question/24216590

Answer:

h = 7.42 m

Explanation:

deceleration of the rock

$a = g sin \theta + \mu_kgcos \theta$

$a = 9.8 sin 42^0+0.425* 9.8 * cos 42^0$

a = 9.65 m/s²

using formula

v² = u² + 2 a s

v² = 15² - 2×9.65 × 10

v = 5.66 m/s

the height attained is

h₁ = 10 sin θ

= 10 sin 42

= 6.69 m

now with vertical velocity it will reach to the height h₂

v y = v sin θ

= 5.66 sin 42

= 3.79 m/s

height is

v² = u² + 2 a s

0 = 3.79² - 2 × 9.8 ×h₂

h₂ = 0.73 m

the maximum height is

h = h₁ + h₂

= 6.69 + 0.73

h = 7.42 m

The circus dog in the picture below is balancing a ball on his nose. The ball has __________ energy right now, but when he drops the ball it will have __________ energy.

Answers

Right now the ball only has potential energy but when the ball falls that will be converted into kinetic energy because it is moving. BTW Im 14 in 9th grade ya'll should know this.

Answer:

potential; kinetic

Explanation:

The answer to number 9 please