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Lyrx [107]
3 years ago
13

A crossbow is fired horizontally off a cliff with an initial velocity of 15 m/s. If the arrow takes 4s to hit the ground, what i

s the range of the projectile?
Physics
1 answer:
omeli [17]3 years ago
5 0

Answer:

The range of the projectile is 60 meters

Explanation:

To determine the range/distance of the projectile, the formula for velocity is used;

velocity = distance/time

where velocity is 15 m/s

time is 4 seconds

distance is unknown

From the formula above, distance is made the subject and thus

distance = velocity × time

distance = 15 × 4

distance = 60 m

The range of the projectile is 60 meters

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How did newton use creativity and logic in his approach to investigating light?
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He used is logic to form a structure that could hold light a light bulb.
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What would be the projectile's initial speed?
zalisa [80]

Math is the process of using the given information, along with
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8 0
3 years ago
Given two vectors A--> = 4.20 i^+ 7.20 j^ and B--> = 5.70 i^− 2.40 j^ , find the scalar product of the two vectors A-->
Arisa [49]

Answer:

\vec{A}\times \vec{B}=-51.12\hat{k}

\theta=83.2^{\circ}

Explanation:

We are given that

\vec{A}=4.2\hat{i}+7.2\hat{j}

\vec{B}=5.70\hat{i}-2.40\hat{j}

We have to find the scalar product and the  angle between these two vectors

\vec{A}\times \vec{B}=\begin{vmatrix}i&j&k\\4.2&7.2&0\\5.7&-2.4&0\end{vmatrix}

\vec{A}\times \vec{B}=\hat{k}(-10.08-41.04)=-51.12\hatk}\hat{k}

Angle between two vectors is given by

sin\theta=\frac{\mid a\times b\mid}{\mid a\mid \mi b\mid}

Where \theta in degrees

\mid{\vec{A}}\mid=\sqrt{(4.2)^2+(7.2)^2}=8.3

Using formula\mid a\mid=\sqrt{x^2+y^2}

Where x= Coefficient of unit vector i

y=Coefficient of unit vector j

\mid{\vec{B}}\mid=\sqrt{5.7)^2+(-2.4)^2}=6.2

\mid{\vec{A}\times \vec{B}}\mid=\sqrt{(-51.12)^2}=51.12

Using the formula

sin\theta=\frac{51.12}{8.3\times 6.2}=0.993

\theta=sin^{-1}(0.993)=83.2degrees

Hence, the angle between given two vectors=83.2^{\circ}

7 0
4 years ago
All digits shown on measuring device, plus one estimated digit, are considered_______.
vichka [17]

Significant

Explanation:

All the digits shown on a measuring device and one estimated digit are all considered to be significant.

A significant digit is a set of values that shows how precise a measurement is reported.

Measuring devices such as calculators gives their values in significant digits.

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learn more:

Significant digits brainly.com/question/2743055

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3 0
3 years ago
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