Determine angle between 2 vectors.
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If there are two vectors given
$$vec {OA} = hat i + 2hat j~~text{and}~~vec {OB} = 4hat i + phat k $$
Then find the values of $p$ for which $angle AOB = cos^{-1}(frac{1}{5})$.
Would someone please give me a hand on solving this?
vectors angle
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add a comment |
up vote
-1
down vote
favorite
If there are two vectors given
$$vec {OA} = hat i + 2hat j~~text{and}~~vec {OB} = 4hat i + phat k $$
Then find the values of $p$ for which $angle AOB = cos^{-1}(frac{1}{5})$.
Would someone please give me a hand on solving this?
vectors angle
New contributor
1
Welcome to MSE. It will be more likely that you will get an answer if you show us that you made an effort. This should be added to the question rather than in the comments.
– José Carlos Santos
22 hours ago
add a comment |
up vote
-1
down vote
favorite
up vote
-1
down vote
favorite
If there are two vectors given
$$vec {OA} = hat i + 2hat j~~text{and}~~vec {OB} = 4hat i + phat k $$
Then find the values of $p$ for which $angle AOB = cos^{-1}(frac{1}{5})$.
Would someone please give me a hand on solving this?
vectors angle
New contributor
If there are two vectors given
$$vec {OA} = hat i + 2hat j~~text{and}~~vec {OB} = 4hat i + phat k $$
Then find the values of $p$ for which $angle AOB = cos^{-1}(frac{1}{5})$.
Would someone please give me a hand on solving this?
vectors angle
vectors angle
New contributor
New contributor
edited 22 hours ago
Rakibul Islam Prince
80529
80529
New contributor
asked 23 hours ago
Mikail Khan
31
31
New contributor
New contributor
1
Welcome to MSE. It will be more likely that you will get an answer if you show us that you made an effort. This should be added to the question rather than in the comments.
– José Carlos Santos
22 hours ago
add a comment |
1
Welcome to MSE. It will be more likely that you will get an answer if you show us that you made an effort. This should be added to the question rather than in the comments.
– José Carlos Santos
22 hours ago
1
1
Welcome to MSE. It will be more likely that you will get an answer if you show us that you made an effort. This should be added to the question rather than in the comments.
– José Carlos Santos
22 hours ago
Welcome to MSE. It will be more likely that you will get an answer if you show us that you made an effort. This should be added to the question rather than in the comments.
– José Carlos Santos
22 hours ago
add a comment |
1 Answer
1
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oldest
votes
up vote
0
down vote
accepted
HINT:
Try to use Dot product rule.which is
$$vec A. vec B=|vec A|.|vec B|.cos theta $$
Here,
$$vec A= hat i + 2hat j,vec B=4hat i + phat k$$
$$|vec A|=sqrt{1^2+2^2}=sqrt{5}~~,~~|vec B|=sqrt{16+p^2}$$
$$theta=cos^{-1}(frac{1}{5})$$
If you substitute everything in the formula I think you will get, $$p=pm 8$$
Assalamualikum! it will be great if you show me substituted form, Thanks brother!
– Mikail Khan
22 hours ago
At last you should get something like $4=sqrt{5}.sqrt{16+p^2}.cosbigg(cos^{-1}(frac{1}{5})bigg)$
– Rakibul Islam Prince
22 hours ago
Thank you so much man! I was stuck at the theta step, i forgot to put cos!
– Mikail Khan
22 hours ago
welcome to MSE family.
– Rakibul Islam Prince
22 hours ago
add a comment |
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
0
down vote
accepted
HINT:
Try to use Dot product rule.which is
$$vec A. vec B=|vec A|.|vec B|.cos theta $$
Here,
$$vec A= hat i + 2hat j,vec B=4hat i + phat k$$
$$|vec A|=sqrt{1^2+2^2}=sqrt{5}~~,~~|vec B|=sqrt{16+p^2}$$
$$theta=cos^{-1}(frac{1}{5})$$
If you substitute everything in the formula I think you will get, $$p=pm 8$$
Assalamualikum! it will be great if you show me substituted form, Thanks brother!
– Mikail Khan
22 hours ago
At last you should get something like $4=sqrt{5}.sqrt{16+p^2}.cosbigg(cos^{-1}(frac{1}{5})bigg)$
– Rakibul Islam Prince
22 hours ago
Thank you so much man! I was stuck at the theta step, i forgot to put cos!
– Mikail Khan
22 hours ago
welcome to MSE family.
– Rakibul Islam Prince
22 hours ago
add a comment |
up vote
0
down vote
accepted
HINT:
Try to use Dot product rule.which is
$$vec A. vec B=|vec A|.|vec B|.cos theta $$
Here,
$$vec A= hat i + 2hat j,vec B=4hat i + phat k$$
$$|vec A|=sqrt{1^2+2^2}=sqrt{5}~~,~~|vec B|=sqrt{16+p^2}$$
$$theta=cos^{-1}(frac{1}{5})$$
If you substitute everything in the formula I think you will get, $$p=pm 8$$
Assalamualikum! it will be great if you show me substituted form, Thanks brother!
– Mikail Khan
22 hours ago
At last you should get something like $4=sqrt{5}.sqrt{16+p^2}.cosbigg(cos^{-1}(frac{1}{5})bigg)$
– Rakibul Islam Prince
22 hours ago
Thank you so much man! I was stuck at the theta step, i forgot to put cos!
– Mikail Khan
22 hours ago
welcome to MSE family.
– Rakibul Islam Prince
22 hours ago
add a comment |
up vote
0
down vote
accepted
up vote
0
down vote
accepted
HINT:
Try to use Dot product rule.which is
$$vec A. vec B=|vec A|.|vec B|.cos theta $$
Here,
$$vec A= hat i + 2hat j,vec B=4hat i + phat k$$
$$|vec A|=sqrt{1^2+2^2}=sqrt{5}~~,~~|vec B|=sqrt{16+p^2}$$
$$theta=cos^{-1}(frac{1}{5})$$
If you substitute everything in the formula I think you will get, $$p=pm 8$$
HINT:
Try to use Dot product rule.which is
$$vec A. vec B=|vec A|.|vec B|.cos theta $$
Here,
$$vec A= hat i + 2hat j,vec B=4hat i + phat k$$
$$|vec A|=sqrt{1^2+2^2}=sqrt{5}~~,~~|vec B|=sqrt{16+p^2}$$
$$theta=cos^{-1}(frac{1}{5})$$
If you substitute everything in the formula I think you will get, $$p=pm 8$$
edited 22 hours ago
answered 22 hours ago
Rakibul Islam Prince
80529
80529
Assalamualikum! it will be great if you show me substituted form, Thanks brother!
– Mikail Khan
22 hours ago
At last you should get something like $4=sqrt{5}.sqrt{16+p^2}.cosbigg(cos^{-1}(frac{1}{5})bigg)$
– Rakibul Islam Prince
22 hours ago
Thank you so much man! I was stuck at the theta step, i forgot to put cos!
– Mikail Khan
22 hours ago
welcome to MSE family.
– Rakibul Islam Prince
22 hours ago
add a comment |
Assalamualikum! it will be great if you show me substituted form, Thanks brother!
– Mikail Khan
22 hours ago
At last you should get something like $4=sqrt{5}.sqrt{16+p^2}.cosbigg(cos^{-1}(frac{1}{5})bigg)$
– Rakibul Islam Prince
22 hours ago
Thank you so much man! I was stuck at the theta step, i forgot to put cos!
– Mikail Khan
22 hours ago
welcome to MSE family.
– Rakibul Islam Prince
22 hours ago
Assalamualikum! it will be great if you show me substituted form, Thanks brother!
– Mikail Khan
22 hours ago
Assalamualikum! it will be great if you show me substituted form, Thanks brother!
– Mikail Khan
22 hours ago
At last you should get something like $4=sqrt{5}.sqrt{16+p^2}.cosbigg(cos^{-1}(frac{1}{5})bigg)$
– Rakibul Islam Prince
22 hours ago
At last you should get something like $4=sqrt{5}.sqrt{16+p^2}.cosbigg(cos^{-1}(frac{1}{5})bigg)$
– Rakibul Islam Prince
22 hours ago
Thank you so much man! I was stuck at the theta step, i forgot to put cos!
– Mikail Khan
22 hours ago
Thank you so much man! I was stuck at the theta step, i forgot to put cos!
– Mikail Khan
22 hours ago
welcome to MSE family.
– Rakibul Islam Prince
22 hours ago
welcome to MSE family.
– Rakibul Islam Prince
22 hours ago
add a comment |
Mikail Khan is a new contributor. Be nice, and check out our Code of Conduct.
Mikail Khan is a new contributor. Be nice, and check out our Code of Conduct.
Mikail Khan is a new contributor. Be nice, and check out our Code of Conduct.
Mikail Khan is a new contributor. Be nice, and check out our Code of Conduct.
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1
Welcome to MSE. It will be more likely that you will get an answer if you show us that you made an effort. This should be added to the question rather than in the comments.
– José Carlos Santos
22 hours ago