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mart [117]
3 years ago
8

Marcus drove his Honda Prelude for 4 hours at a rate of 55 miles per hour. How far did he travel?

Physics
2 answers:
galben [10]3 years ago
7 0
To solve this, you’d multiply 55 by 4, because he is travelling 55 miles every hour, for four hours, which means 55 miles every hour. The answer would be 220.
lilavasa [31]3 years ago
5 0

Answer : Distance covered is 220 miles.

Explanation :

It is given that,

Speed of Marcus's Honda Prelude, v=55\ miles/hour

Time duration, t=4\ hours

We know that the speed of an object is defined as the distance travelled per unit time.

v=\dfrac{d}{t}

or

d=v\times t

d=55\ miles/hour\times 4\ hours

d=220\ miles

Hence, this is the required solution.      

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If a ball is thrown vertically upward from the roof of 32 foot building with a velocity of 64 ft/sec, its height after t seconds
stepan [7]

Answer:

a) s_{max} = 96\,ft, b) v(4.449\,s) = -78.368\,\frac{ft}{s}

Explanation:

a) The maximum height is obtained with the help of the First and Second Derivative Tests:

First Derivative

v(t) = 64 - 32\cdot t

64 - 32\cdot t = 0

t = 2\,s

Second Derivative

a(t) = -32 (absolute maximum)

The maximum height reached by the ball is:

s (2\,s) = 32 + 64\cdot (2\,s) - 16\cdot (2\,s)^{2}

s_{max} = 96\,ft

b) The time required by the ball to hit the ground is:

32+64\cdot t - 16\cdot t^{2} = 0

-16\cdot (t^{2}-4\cdot t - 2) = 0

t^{2}-4\cdot t - 2 = 0

(t -4.449)\cdot (t+0.449)\approx 0

Just one root offers a solution that is physically reasonable:

t = 4.449\,s

The velocity of the ball when it hits the ground is:

v(4.449\,s) = 64 - 32\cdot (4.449\,s)

v(4.449\,s) = -78.368\,\frac{ft}{s}

6 0
3 years ago
Read 2 more answers
A spring scale reads 20 N as it pulls a 4 kilogram box across a table. What is the magnitude of the force exerted by the mass on
Ivan
The answer is 40!!!!!!!!!!!!!
6 0
3 years ago
Can you complete and EXPLAIN please?????:(
jonny [76]

Answer:

Explanation:

Well you have the voltages right, and that is no trivial matter. Each one of the resistors in a parallel circuit sees the same input voltages (in this case 6).

Now I think it would be a good idea to fill in the the resistance column.

R1 = 3 ohms

R2 = 6 ohms

R3 = 2 ohms

The total resistance can be calculated in two ways. I'll get around to doing both of them but I'll do the conventional way first. One hint: the total resistance must be smaller than the smallest resistor. Read that sentence over a couple of times. What it means is that it must be less than 2 ohms in a parallel circuit.

1/r1 + 1/r2 + 1/r3 = 1/rt

1/3 + 1/6 + 1/2 = 1/rt

Change all the denominators to 6ths.

2/6 + 1/6 + 3/6 = 1/rt

(2 + 1 + 3)/6 = 6/6  = 1

rt = 1

====================

So the current I is V/R

V = 6

R = 1

Current = V/R = 6/1 = 6 amps.

====================

The current in each resistor is

I1 = V / R1

I1 = 6/3 = 2 amps

I2 = V/R2

I2 = 6/6 = 1 amp

I3 = 6/2 = 3 amps

The total is I1 + I2 + I3 = 2 + 1 + 3 = 6 amps.

======================

Remember I said there was 2 ways of figuring out the total resistance. I did one of them about. Here's the other.

R = V / It

R = 6 / 6

R = 1 ohm just what you got before.

====================

Power

P = V * I

P1 = 6 * 2 = 12 watts

P2 = 6*1   = 6 watts

P3 = 6*3 = 18 watts

Pt =            36 watts.

Pt can be done by using the voltage * the total current

Pt = 6 volts * 6 amps = 36 watts, just what you would expect.

3 0
3 years ago
Complete the sentence. Atoms form chemical bonds to satisfy the _____ rule and to become ______ .
Aliun [14]

the first one is octet and the second one is stable

6 0
3 years ago
Read 2 more answers
A 120kg defensive lineman tackles a stationary quarterback at 6.5 m/s it takes .25 seconds for the lineman to completely stop wh
DIA [1.3K]

Answer:

F = -3120 N

Explanation:

Lets write out everything we have:

Lineman:

m = 120kg

V1 = 6.5m/s

v2 = 0

t = 0.25

We should find acceleration, to move on to the next step;

a = v2-v1 / t

a = 0 - 6.5 / 0.25

a = -26m/s^2

Now we can use the Fnet formula and solve for F;

Fnet  = ma

fnet = (120)(-26)

F = -3120 N

8 0
4 years ago
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